C Programming

Sequential program
1. Write a program to find sum of two numbers where first number is 45 and second number
is to be input through keyboard.

Solution:
#include <stdio.h>
int main()
{
int num1 = 45;
int num2;
printf("Enter the second number: ");
scanf("%d", &num2);
int sum = num1 + num2;
printf("The sum of %d and %d is %d.\n", num1, num2, sum);
return 0;
}

2. Write a program to swap 2 integer numbers by using a third variable.

Solution:
#include <stdio.h>
int main()
{
int num1, num2, temp;

printf("Enter first number: ");

scanf("%d", &num1);

printf("Enter second number: ");

scanf("%d", &num2);

printf("\nBefore swapping:\n");
printf("First number: %d\n", num1);
printf("Second number: %d\n", num2);

// Swapping using a third variable

temp = num1;
num1 = num2;
num2 = temp;

printf("\nAfter swapping:\n");
printf("First number: %d\n", num1);
printf("Second number: %d\n", num2);
 return 0;
}

3. Write a simple program to calculate addition, subtraction and multiplication of 3 different

integer and floating point variables and display results.
Solution:
#include <stdio.h>
int main()
{
// Integer variables
int a = 10, b = 5, c = 3;
// Floating-point variables
float x = 7.5, y = 3.2, z = 1.8;
// Addition
int int_sum = a + b + c;
float float_sum = x + y + z;
// Subtraction
int int_diff = a - b - c;
float float_diff = x - y - z;
// Multiplication
int int_prod = a * b * c;
float float_prod = x * y * z;
// Displaying results
printf("Addition:\n");
printf("Integer sum: %d\n", int_sum);
printf("Floating-point sum: %.2f\n", float_sum);
printf("\nSubtraction:\n");
printf("Integer difference: %d\n", int_diff);
printf("Floating-point difference: %.2f\n", float_diff);
printf("\nMultiplication:\n");
printf("Integer product: %d\n", int_prod);
printf("Floating-point product: %.2f\n", float_prod);
return 0;
}
4. Write a program to ask user to input 4 different integer value and find the average.
Solution:
#include <stdio.h>
int main()
{
int num1, num2, num3, num4;
float average;
printf("Enter the first number: ");
 scanf("%d", &num1);

printf("Enter the second number: ");

scanf("%d", &num2);
printf("Enter the third number: ");
scanf("%d", &num3);
printf("Enter the fourth number: ");
scanf("%d", &num4);
// Calculate average
average = (num1 + num2 + num3 + num4) / 4.0;
printf("The average of four number is %.2f\n", average);
return 0;
}
5. Write a C program to read marks of 3 subjects and print obtained percentage marks.
Solution:
#include <stdio.h>
int main()
{
int eng, maths, comp;
float total_marks, per;

// Input marks for three subjects

printf("Enter marks for English: ");
scanf("%d", &eng);

printf("Enter marks for Maths: ");

scanf("%d", &maths);

printf("Enter marks for Computer: ");

scanf("%d", &comp);

// Calculate total marks

total_marks = eng + maths + comp;

// Calculate percentage
per = (total_marks / 300.0) * 100;

// Print the obtained percentage marks

printf("Obtained percentage marks: %.2f%%\n", per);
return 0;
}
6. Write a program that takes two integer numbers as input from the user, calculates the
quotient and remainder using the / and % operators respectively, and then displays the
results.
Solution:
#include <stdio.h>
int main()
{
int num1, num2, quotient, remainder;

// Input two integer numbers

printf("Enter the first integer number: ");
scanf("%d", &num1);

printf("Enter the second integer number: ");

scanf("%d", &num2);

// Calculate quotient and remainder

quotient = num1 / num2;
remainder = num1 % num2;

// Display the results

printf("Quotient of %d divided by %d is %d\n", num1, num2, quotient);
printf("Remainder of %d divided by %d is %d\n", num1, num2, remainder);
return 0;
}
7. A company gives Rs. 20,000 to as basic salary per month to its employee, 10% of basic
salary as provident fund and 10% of basic salary as CIT, deducts 1% as tax of the basic
Salary. Now, write a program to find the net salary of the employee.
Solution:
#include <stdio.h>
int main()
{
float basic_salary = 20000;
float provident_fund, cit, tax, net_salary;

// Calculate provident fund, CIT, and tax

provident_fund = 0.1 * basic_salary;
cit = 0.1 * basic_salary;
tax = 0.01 * basic_salary;

// Calculate net salary

net_salary = basic_salary - provident_fund - cit - tax;
 // Display the results
printf("Basic Salary: Rs. %.2f\n", basic_salary);
printf("Provident Fund: Rs. %.2f\n", provident_fund);
printf("CIT: Rs. %.2f\n", cit);
printf("Tax: Rs. %.2f\n", tax);
printf("Net Salary: Rs. %.2f\n", net_salary);
return 0;
}
8. Write a C program to compute the perimeter and area of a circle with a given radius. Use
pi=3.14.
Solution:
#include <stdio.h>
#define PI 3.14
int main()
{
float radius, perimeter, area;

// Input radius from the user

printf("Enter the radius of the circle: ");
scanf("%f", &radius);

// Calculate perimeter (circumference)

perimeter = 2 * PI * radius;

// Calculate area
area = PI * radius * radius;

// Display the results

printf("Perimeter (Circumference) of the circle: %.2f\n", perimeter);
printf("Area of the circle: %.2f\n", area);
return 0;
}
9. Write a program to find simple interest where principle is Rs.1000, rate 10% and time is
5 years.
Solution:
#include <stdio.h>
int main()
{
float p = 1000;
float r = 10;
float t = 5;
float simple_interest;
simple_interest = (p * r * t) / 100;
 printf("Simple Interest: Rs. %.2f\n", simple_interest);
return 0;
}
10. Write a C program to calculate a bike’s average fuel consumption from the given total
distance (integer value) travelled in km and spent fuel in litters, you can use float number
upto 2 decimal points.
Solution:

#include <stdio.h>
int main()
{
int total_distance;
float fuel_spent, average_consumption;

// Input total distance traveled in km

printf("Enter the total distance traveled (in km): ");
scanf("%d", &total_distance);

// Input fuel spent in liters

printf("Enter the fuel spent (in liters): ");
scanf("%f", &fuel_spent);

// Calculate average fuel consumption

average_consumption = fuel_spent / total_distance;

// Display the result

printf("Average fuel consumption: %.2f liters/km\n", average_consumption);

return 0;
}
11. Write a C program to convert specified days into years, weeks and days.
Solution:
#include <stdio.h>

int main()
{
int days, years, weeks;

days = 1329; // Total number of days

// Converts days to years, weeks and days

years = days/365; // Calculate years
 weeks = (days % 365)/7; // Calculate weeks
days = days - ((years*365) + (weeks*7)); // Calculate remaining days

// Print the results

printf("Years: %d\n", years);
printf("Weeks: %d\n", weeks);
printf("Days: %d \n", days);
return 0;
}

Selection control statement Or Decision Control Statement:

(if …statement)
12. Write a C program to accept two integers and check whether they are equal or not.
Solution:
#include <stdio.h>
int main()
{
// Declare two integer variables 'int1' and 'int2'.
int num1, num2;

printf("Input the values for Number1 and Number2 : ");

scanf("%d %d", &num1, &num2);
if (num1 == num2)
printf("Number1 and Number2 are equal\n");
else
printf("Number1 and Number2 are not equal\n");
return 0;
}

13. Write a C program to accept two integer numbers and check whether the second number
is greater or not?
Solution:
#include <stdio.h>
int main() {
int num1, num2;

printf("Enter the first integer number: ");

scanf("%d", &num1);

printf("Enter the second integer number: ");

scanf("%d", &num2);
 if (num2 > num1)
{
printf("The 2nd number %d is greater than the 1st number %d.\n", num2, num1);
}
else
{
printf("The 2nd number %d is not greater than the 1st number %d.\n", num2, num1);
}
return 0;
}
14. Write a C program to check whether a given number is even or odd.

Solution:
#include <stdio.h>
int main()
{
int num, rem;
printf("Input an integer : ");
scanf("%d", &num);
rem = num % 2; // finds remainder of 'num' when divided by 2.
if (rem == 0) // Check if the remainder is equal to 0.
printf("%d is an even integer\n", num);
else
printf("%d is an odd integer\n", num);
return 0;
}

15. Write a C program to check whether a person is eligible for voting or not.[eligible age is
18 years and more]
Solution:
#include<stdio.h>
int main()
{
int a ;
printf("Enter the age of the person: ");
scanf("%d",&a);
if (a>=18)
{
printf("You are Eligible for voting");
}
else
 {
printf("You are Not Eligible for voting\n");
}

return 0;
}

16. Write a program to enter any integer number and check whether it is exactly divisible by
3 and 5 or not?
Solution:
#include <stdio.h>
int main()
{
int num;
printf("Enter an integer number: ");
scanf("%d", &num);
if (num % 3 == 0 && num % 5 == 0)
{
printf("%d is divisible by both 3 and 5.\n", num);
}
else {
printf("%d is not divisible by both 3 and 5.\n", num);
}
return 0;
}
17. Write a program to enter any three numbers and find the smallest one.
Solution:
#include <stdio.h>
int main()
{
int num1, num2, num3;
printf("Enter three numbers: ");
scanf("%d %d %d", &num1, &num2, &num3);

if (num1 < num2 && num1 < num3)

{
printf("First number %d is smallest\n", num1);
}
else if (num2 < num1 && num2 < num3)
{
printf("Second number %d is smallest\n", num2);
}
 else if (num3 < num1 && num3 < num2)
{
printf("Third number %d is smallest\n", num3);
}
else
{
printf("Invalid input\n");
}
return 0;
}

18. Write a program to input ‘Y’ or ‘N’ for whether a person has citizenship or not and then
on the basis of age factor decide whether he/she is eligible for driving license for 4
wheeler vehicle or not. [Note: Government of Nepal only allows Nepalese citizens who
are above 20 years of age.]
Solution:
#include <stdio.h>
int main()
{
char citizenship;
int age;
/ Prompting user to input citizenship status ('Y' or 'N')
printf("Do you have citizenship? (Y/N): ");
scanf(" %c", &citizenship); // the space before %c to consume any leading whitespace

// Checking if the person has citizenship

if (citizenship == 'Y' || citizenship == 'y')
{
// Prompting user to input age
printf("Enter your age: ");
scanf("%d", &age);

// Checking age eligibility for driving license

if (age >= 20) {
printf("Congratulations! You are eligible for a driving license for a four-wheeler
vehicle.\n");
} else {
printf("Sorry, you are not eligible for a driving license for a four-wheeler vehicle.\
n");
}
} else if (citizenship == 'N' || citizenship == 'n') {
printf("Sorry, only Nepalese citizens are eligible for a driving license.\n");
 } else {
printf("Invalid input. Please enter either 'Y' or 'N'.\n");
}
return 0;
}
19. Write a program to check a given character is a lowercase character or uppercase without
using library function.

Solution:
#include <stdio.h>
int main() {
char ch;

// Prompting user to enter a character

printf("Enter a character: ");
scanf("%c", &ch);

// Checking if the character is lowercase

if (ch >= 'a' && ch <= 'z') {
printf("%c is a lowercase character.\n", ch);
}
// Checking if the character is uppercase
else if (ch >= 'A' && ch <= 'Z') {
printf("%c is an uppercase character.\n", ch);
}
// If the character is not a letter
else {
printf("%c is not a letter.\n", ch);
}

return 0;
}
20. Write a program to check a given character is a vowel or not without using library
function.
Solution:
#include <stdio.h>
int main() {
char ch;

// Prompting user to enter a character

printf("Enter a character: ");
scanf(" %c", &ch); // Note the space before %c to consume any leading whitespace
 // Checking if the character is a vowel
if ((ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') ||
(ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U')) {
printf("%c is a vowel.\n", ch);
} else {
printf("%c is not a vowel.\n", ch);
}
return 0;
}
21. Write a program to ask user to input lowercase character and convert into uppercase
without using library function.
Solution:
#include <stdio.h>

int main() {
char lowercase, uppercase;

// Prompting user to enter a lowercase character

printf("Enter a lowercase character: ");
scanf(" %c", &lowercase); // Note the space before %c to consume any leading
whitespace

// Checking if the input is a lowercase character

if (lowercase >= 'a' && lowercase <= 'z') {
// Converting to uppercase by subtracting the ASCII value difference
uppercase = lowercase - ('a' - 'A');
printf("Uppercase equivalent: %c\n", uppercase);
} else {
printf("Invalid input. Please enter a lowercase character.\n");
}

return 0;
}
22. Write a program to enter marks of 5 subjects of a student, calculate their percentage
marks and find the grading A, B, C or D on the basis of following:
a. If percentage marks <50 then assign grade D
b. If percentage marks between 50 to 60 then assign grade C
c. If percentage marks between 61 to 79.99 then assign grade B
d. If percentage marks greater than or equal to 80 then assign grade A

Solution:
#include <stdio.h>
int main() {
int marks[5];
float total_marks = 0, percentage;
char grade;

// Prompting user to enter marks for 5 subjects

printf("Enter marks for 5 subjects:\n");
for (int i = 0; i < 5; i++) {
printf("Enter marks for subject %d: ", i + 1);
scanf("%d", &marks[i]);
total_marks += marks[i];
}

// Calculating percentage
percentage = (total_marks / 5.0);

// Assigning grade based on percentage

if (percentage >= 80) {
grade = 'A';
} else if (percentage >= 61 && percentage < 80) {
grade = 'B';
} else if (percentage >= 50 && percentage < 61) {
grade = 'C';
} else {
grade = 'D';
}

// Printing percentage and grade

printf("Percentage Marks: %.2f%%\n", percentage);
printf("Grade: %c\n", grade);

return 0;
}
23. Write a program to check whether an entered year is a leap year or not.
Note: A leap year is such which is divisible by 4, if the year is divisible by 100 then it
should also be divisible by 400.

Solution:
#include <stdio.h>
int main() {
int year;
 // Prompting user to enter a year
printf("Enter a year: ");
scanf("%d", &year);

// Checking if the year is a leap year

if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
printf("%d is a leap year.\n", year);
} else {
printf("%d is not a leap year.\n", year);
}

return 0;
}

Switch case statement

24. Write a program to check entered character is VOWEL or CONSONANT using if and
switch.. case statement.
Solution:
#include <stdio.h>
int main() {
char ch;

// Prompting user to enter a character

printf("Enter a character: ");
scanf(" %c", &ch); // Note the space before %c to consume any leading whitespace

// Using if statement to check if the character is a vowel or consonant

if (ch >= 'A' && ch <= 'Z') {
ch = ch + 32; // Convert uppercase to lowercase for simplicity
}
if (ch >= 'a' && ch <= 'z') {
if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
printf("%c is a vowel.\n", ch);
} else {
printf("%c is a consonant.\n", ch);
}
} else {
printf("Invalid input. Please enter an alphabet.\n");
}

// Using switch...case statement to check if the character is a vowel or consonant

switch(ch) {
case 'a':
 case 'e':
case 'i':
case 'o':
case 'u':
printf("%c is a vowel.\n", ch);
break;
default:
if (ch >= 'a' && ch <= 'z') {
printf("%c is a consonant.\n", ch);
}
break;
}

return 0;
}
25. Write a program using switch case statement that will ask user two integers and Display a
sample menu like
1. Addition
2. Subtraction
3. Multiplication
4. Division
Once user selects option from the list do the arithmetic operation as per and display the
result.
Solution:
#include <stdio.h>
int main() {
int num1, num2, choice;
float result;

// Prompting user to enter two integers

printf("Enter two integers: ");
scanf("%d %d", &num1, &num2);

// Displaying the menu

printf("\nSample Menu:\n");
printf("1. Addition\n");
printf("2. Subtraction\n");
printf("3. Multiplication\n");
printf("4. Division\n");
printf("Enter your choice (1-4): ");
scanf("%d", &choice);

// Performing the arithmetic operation based on user's choice

switch (choice) {
case 1:
result = num1 + num2;
 printf("Result of addition: %.2f\n", result);
break;
case 2:
result = num1 - num2;
printf("Result of subtraction: %.2f\n", result);
break;
case 3:
result = num1 * num2;
printf("Result of multiplication: %.2f\n", result);
break;
case 4:
// Checking if num2 is not zero to avoid division by zero
if (num2 != 0) {
result = (float)num1 / num2;
printf("Result of division: %.2f\n", result);
} else {
printf("Error! Division by zero is not allowed.\n");
}
break;
default:
printf("Invalid choice! Please enter a number between 1 and 4.\n");
}

return 0;
}
26. Write a program using switch case statement that will ask user any number from 1 to 12
and display name of month.[1- baishakh, 2- Jestha……]
Solution:
#include <stdio.h>
int main() {
int month_number;

// Prompting user to enter a number from 1 to 12

printf("Enter a number from 1 to 12: ");
scanf("%d", &month_number);

// Displaying the name of the month based on the entered number

switch (month_number) {
case 1:
printf("Month %d is Baishakh.\n", month_number);
break;
case 2:
printf("Month %d is Jestha.\n", month_number);
break;
case 3:
 printf("Month %d is Ashar.\n", month_number);
break;
case 4:
printf("Month %d is Shrawan.\n", month_number);
break;
case 5:
printf("Month %d is Bhadra.\n", month_number);
break;
case 6:
printf("Month %d is Ashoj.\n", month_number);
break;
case 7:
printf("Month %d is Kartik.\n", month_number);
break;
case 8:
printf("Month %d is Mangsir.\n", month_number);
break;
case 9:
printf("Month %d is Poush.\n", month_number);
break;
case 10:
printf("Month %d is Magh.\n", month_number);
break;
case 11:
printf("Month %d is Falgun.\n", month_number);
break;
case 12:
printf("Month %d is Chaitra.\n", month_number);
break;
default:
printf("Invalid input! Please enter a number between 1 and 12.\n");
}

return 0;
}

Iteration Control Statement: Looping

27. Write a program using while loop to display the n terms of odd natural numbers. (eg: 1 3
5 ………. N)
Solution:
#include <stdio.h>
int main() {
int n, count = 1;
 // Prompting user to enter the value of n
printf("Enter the value of n: ");
scanf("%d", &n);

// Displaying the n terms of odd natural numbers using a while loop

printf("The first %d odd natural numbers are:\n", n);
while (n > 0) {
printf("%d ", count);
count += 2; // Incrementing count by 2 to get the next odd number
n--;
}
printf("\n");

return 0;
}
28. Write a program to ask any number from the user and print their table using for loop.
Solution:
#include <stdio.h>
int main() {
int number;

// Prompting user to enter a number

printf("Enter a number: ");
scanf("%d", &number);

// Printing the multiplication table of the entered number using a for loop
printf("Multiplication table of %d:\n", number);
for (int i = 1; i <= 10; i++) {
printf("%d x %d = %d\n", number, i, number * i);
}

return 0;
}
29. Write a program to find the sum of n natural numbers.
Solution:
#include <stdio.h>
int main() {
int n, sum = 0;

// Prompting user to enter the value of n

printf("Enter the value of n: ");
scanf("%d", &n);

// Calculating the sum of the first n natural numbers using a loop

for (int i = 1; i <= n; i++) {
sum += i;
 }

// Printing the sum

printf("The sum of the first %d natural numbers is: %d\n", n, sum);

return 0;
}
30. Write a program to find the sum of n even natural numbers.
Solution:
#include <stdio.h>
int main() {
int n, sum = 0;

// Prompting user to enter the value of n

printf("Enter the value of n: ");
scanf("%d", &n);

// Calculating the sum of the first n even natural numbers

for (int i = 1; i <= n; i++) {
sum += 2 * i; // Even natural numbers follow the pattern 2, 4, 6, ...
}

// Printing the sum

printf("The sum of the first %d even natural numbers is: %d\n", n, sum);

return 0;
}
31. Write a program to find the LCM of Two numbers.
Solution:
#include <stdio.h>
// Function to find the GCD (greatest common divisor) of two numbers
int gcd(int a, int b) {
while (b != 0) {
int temp = b;
b = a % b;
a = temp;
}
return a;
}

// Function to find the LCM (least common multiple) of two numbers

int lcm(int a, int b) {
return (a * b) / gcd(a, b);
}

int main() {
 int num1, num2;

// Prompting user to enter two numbers

printf("Enter two numbers: ");
scanf("%d %d", &num1, &num2);

// Calculating the LCM and printing the result

printf("The LCM of %d and %d is: %d\n", num1, num2, lcm(num1, num2));

return 0;
}
32. Write a program to find the HCF (Highest Common Factor) of two numbers.
Solution:
#include <stdio.h>
// Function to find the GCD (greatest common divisor) of two numbers
int gcd(int a, int b) {
while (b != 0) {
int temp = b;
b = a % b;
a = temp;
}
return a;
}

int main() {
int num1, num2;

// Prompting user to enter two numbers

printf("Enter two numbers: ");
scanf("%d %d", &num1, &num2);

// Calculating the GCD and printing the result

printf("The HCF of %d and %d is: %d\n", num1, num2, gcd(num1, num2));

return 0;
}
33. Write a program that checks if a given integer number is a binary number or not without
using a separate function: (Hints use number/10 and number % 10 and While loop)
Solution:
#include <stdio.h>
int main() {
int number, digit;

// Prompting user to enter a number

printf("Enter an integer number: ");
scanf("%d", &number);
 // Copying the original number to a temporary variable
int temp = number;

// Flag to indicate if the number is binary or not

int isBinary = 1; // Assume number is binary initially

// Checking each digit of the number

while (temp != 0) {
digit = temp % 10;
if (digit != 0 && digit != 1) {
isBinary = 0; // Update flag if any digit is not 0 or 1
break;
}
temp /= 10;
}

// Checking the flag to determine the result

if (isBinary) {
printf("%d is a binary number.\n", number);
} else {
printf("%d is not a binary number.\n", number);
}

return 0;
}
34. Write a program to find factorial of a number using looping statement.
Solution:
#include <stdio.h>
int main() {
int number;
unsigned long long factorial = 1;

// Prompting user to enter a number

printf("Enter a positive integer: ");
scanf("%d", &number);

// Checking if the number is negative

if (number < 0) {
printf("Error! Factorial of a negative number doesn't exist.\n");
} else {
// Calculating factorial using a loop
for (int i = 1; i <= number; i++) {
factorial *= i;
}
printf("Factorial of %d = %llu\n", number, factorial);
 }

return 0;
}
35. Write a program to generate Fibonacci Series using loop.
Solution:
#include <stdio.h>

int main() {
int n, first = 0, second = 1, next;

// Prompting user to enter the number of terms

printf("Enter the number of terms: ");
scanf("%d", &n);

printf("Fibonacci Series: ");

// Generating Fibonacci series using a loop

for (int i = 0; i < n; i++) {
if (i <= 1) {
next = i;
} else {
next = first + second;
first = second;
second = next;
}
printf("%d ", next);
}

printf("\n");

return 0;
}

Array
36. Write a program to enter any 10 numbers using array and find sum of first, fifth and tenth
element of the array.
Solution:
#include <stdio.h>

int main() {
int numbers[10];
int sum = 0;

// Prompting user to enter 10 numbers and storing them in an array

printf("Enter 10 numbers:\n");
 for (int i = 0; i < 10; i++) {
printf("Enter number %d: ", i + 1);
scanf("%d", &numbers[i]);
}

// Calculating the sum of the first, fifth, and tenth elements

sum = numbers[0] + numbers[4] + numbers[9];

// Printing the sum

printf("Sum of the first, fifth, and tenth elements = %d\n", sum);

return 0;
}
37. Write a program to declare a single dimensional array of 5 elements, take input for all
elements and then display all 5 elements in a row without using loop.
Solution:
#include <stdio.h>
int main() {
int arr[5];

// Taking input for all elements

printf("Enter the elements of the array:\n");
printf("Enter element 1: ");
scanf("%d", &arr[0]);
printf("Enter element 2: ");
scanf("%d", &arr[1]);
printf("Enter element 3: ");
scanf("%d", &arr[2]);
printf("Enter element 4: ");
scanf("%d", &arr[3]);
printf("Enter element 5: ");
scanf("%d", &arr[4]);

// Displaying all 5 elements in a row without using loop

printf("Elements of the array: %d %d %d %d %d\n", arr[0], arr[1], arr[2], arr[3],
arr[4]);

return 0;
}
38. Write a program to find out the average of 10 integers.
Solution:
#include <stdio.h>

int main() {
int numbers[10];
int sum = 0;
 float average;

// Prompting user to enter 10 integers and calculating their sum

printf("Enter 10 integers:\n");
for (int i = 0; i < 10; i++) {
printf("Enter number %d: ", i + 1);
scanf("%d", &numbers[i]);
sum += numbers[i];
}

// Calculating the average

average = (float)sum / 10;

// Printing the average

printf("Average of the 10 integers = %.2f\n", average);

return 0;
}
39. Program to print the smallest number from ‘n’ number of element of the array.
Solution:
#include <stdio.h>

int main() {
int n;

// Prompting user to enter the size of the array

printf("Enter the number of elements in the array: ");
scanf("%d", &n);

int arr[n];

// Prompting user to enter the elements of the array

printf("Enter %d elements:\n", n);
for (int i = 0; i < n; i++) {
printf("Enter element %d: ", i + 1);
scanf("%d", &arr[i]);
}

// Finding the smallest number in the array

int smallest = arr[0]; // Assume the first element as the smallest
for (int i = 1; i < n; i++) {
if (arr[i] < smallest) {
smallest = arr[i];
}
}
 // Printing the smallest number
printf("The smallest number in the array is: %d\n", smallest);

return 0;
}
40. Write a program to find second largest number in an array.

Solution:
#include <stdio.h>

int main() {

int n;

// Prompting user to enter the size of the array

printf("Enter the number of elements in the array: ");

scanf("%d", &n);

// Declaring an array of size n

int arr[n];

// Prompting user to enter the elements of the array

printf("Enter %d elements:\n", n);

for (int i = 0; i < n; i++) {

printf("Enter element %d: ", i + 1);

scanf("%d", &arr[i]);

// Finding the second largest number in the array

int largest = arr[0];

int secondLargest = arr[1];

if (secondLargest > largest) {

 int temp = largest;

largest = secondLargest;

secondLargest = temp;

for (int i = 2; i < n; i++) {

if (arr[i] > largest) {

secondLargest = largest;

largest = arr[i];

} else if (arr[i] > secondLargest && arr[i] != largest) {

secondLargest = arr[i];

// Printing the second largest number

printf("The second largest number in the array is: %d\n", secondLargest);

return 0;