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This document contains solutions to 4 programming lab exercises: 1) A program that inputs 10 integers from the user and prints the largest. It uses variables for a counter, the current number, and the largest found so far. 2) A program that reads a nonnegative integer and calculates and prints its factorial. It initializes a factorial variable and calculates the factorial in a while loop. 3) A program that prints a table of values using a while loop to iterate from 1 to 5 and print the values and their multiples of 10, 100, and 1000. 4) A program that prints a checkerboard pattern using only print statements for asterisks and newlines, checking the row number modulo 2 to alternate spaces and asterisks

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35 views4 pages

لاب3

This document contains solutions to 4 programming lab exercises: 1) A program that inputs 10 integers from the user and prints the largest. It uses variables for a counter, the current number, and the largest found so far. 2) A program that reads a nonnegative integer and calculates and prints its factorial. It initializes a factorial variable and calculates the factorial in a while loop. 3) A program that prints a table of values using a while loop to iterate from 1 to 5 and print the values and their multiples of 10, 100, and 1000. 4) A program that prints a checkerboard pattern using only print statements for asterisks and newlines, checking the row number modulo 2 to alternate spaces and asterisks

Uploaded by

442050215
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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CS2301: Computer Programming 2

Lab #3
Solutions
1. Write a Java application that inputs a series of 10 integers and determines and prints the largest
integer. Your program should use at least the following three variables:
a) counter: A counter to count to 10.
b) number:The integer most recently input by the user.
c) largest: The largest number found so far.

// Program determines and prints the largest of 10 numbers.


import java.util.Scanner;

public class Largest {


// determines the largest of 10 numbers
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

// get first number and assign it to variable largest


System.out.print("Enter number: ");
int largest = input.nextInt();

int counter = 1;

// get rest of the numbers and find the largest


while (counter < 10) {
System.out.print("Enter number: ");
int number = input.nextInt();

if (number > largest) {


largest = number;
}

++counter;
}

System.out.printf("Largest number is %d%n", largest);


}
}

Instructor: Dr.Ameerah Alothman 1st semester 1443


CS2301: Computer Programming 2
Lab #3
Solutions
2. The factorial of a nonnegative integer n is written as n!, and is defined as follows: n!=n·(n–1)·(n–
2)·...·1 (for values of n greater than or equal to 1) and n!=1 (for n=0)
For example, 5! = 5 · 4 · 3 · 2 · 1, which is 120. Write an application that reads a nonnegative integer
and computes and prints its factorial.

// Program calculates a factorial.


import java.util.Scanner;

public class Factorial {


// calculates the factorial of a number
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

int factorial = 1;

System.out.print("Enter a positive Integer: ");


int number = input.nextInt();

System.out.printf("%d! is ", number);

// calculate factorial
while (number > 1) {
factorial *= number;
number--;
}

System.out.println(factorial);
}
}

Instructor: Dr.Ameerah Alothman 1st semester 1443


CS2301: Computer Programming 2
Lab #3
Solutions
3. Write a Java application that uses looping to print the following table of values:

// Program prints a table of values using a while loop.

public class Table {


public static void main(String[] args) {
int n = 1;

System.out.printf("N\t10*N\t100*N\t1000*N%n%n");

while (n <= 5) {
System.out.printf("%d\t%d\t%d\t%d%n",
n, (10 * n), (100 * n), (1000 * n));
++n;
}
}
}

Instructor: Dr.Ameerah Alothman 1st semester 1443


CS2301: Computer Programming 2
Lab #3
Solutions
4. Write an application that uses only the output statements:
System.out.print( "* " );
System.out.print( " " );
System.out.println();
to display the checkerboard pattern that follows. A System.out.println method call with no arguments
causes the program to output a single newline character. [Hint: Repetition statements are required].

// Program prints a checkerboard pattern.


public class Stars {
public static void main(String[] args) {
int row = 1;

while (row <= 8) {


int column = 1;

if (row % 2 == 0) {
System.out.print(" ");
}

while (column <= 8) {


System.out.print("* ");
column++;
}

System.out.println();
row++;
}
}
}

Instructor: Dr.Ameerah Alothman 1st semester 1443

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