C++ THEORY

1. insert the missing part of the code below the output ‘hello
world!’.
Int main()
{
____print___<<”Hello World!”;
Return 0;
}
 #include<iostream.h>
int main()
{
Cout<<”Hello World!”;
Return 0;
}

2. Insert the new line after “Hello World”, by using a special

character:
Int main()
{
Cout<<” Hello World!___\n__”;
Cout<<”Im learning c++”;
Return 0;
}
 #include<iostream.h>
Using namespace std;
Int main()
{
Cout<<”Hello World!\n”;
Cout<<”I’m learning c++;
Return 0;
}
3. This is a single line comment __/**/ __
 No ,it is multi line comment.
4. _// __ this is a multi-line comment __//__.
 No , it is a single line comment.
5. Create a variable named myNum and assign the value of 50 to
it.
 #include<stdio.h>
#include<conio.h>
Void main()
Int myNum=50;
Cout<<”int myNum=”,%d;
Return 0;
6. Display the sum of 5+10,using two variables: x and y.
 #include<stdio.h>

#include<conio.h>

Int main()

Int x=5;

Int y=10;

Int sum=x+y;

Cout<<”The sum of”<<x<<”+”<<y<<”is:”<<sum;

Return 0;

7. Create a variable called z, assign x+y to it, and display the result.
 #include<stdio.h>
#include<conio.>
Void main()
Int x=5;
Int y=10;
Int z=x+y;
Cout<<”x+y =”,z;
Return 0;
8. Fill the missing parts to create three variables of the same
type , using a comma separated list:
 #include<iostream>
Using namespace std;
Int main()
{
Int x=5, y=6 , z=50;
Cout<<” the sum of x+y+z is:”<<x+y+z;
Return 0;
}
9. Use the missing parts to print the sum of two numbers.
Int x,y;
Int sum;
Cout<<”type a number:”;
__cin__>>__x_;
 #include<iostream>
 Using namespace std;
Int main()
{
Int x=5,y=6;
Int sum;
Cout<<”Type a number:”;
Cin>>x;
Cout<<”Type another number:”;
Cin>>y;
Sum=x+y;
Cout<<”The sum is:”<<sum;
Return 0;
}
10. Fill the missing parts to print the sum of two numbers.
Int x,y;
Int sum;
Cout<<”type a number:”;
Cin>>__x_;
Cout<<”type another number:”;
Cin>>_y_;
Sum=x+y;
Cout<<”sum is:”<<x+y;
 #include<iostream>
Using namespace std;
 Int main()
{
Int x=5,y=6;
Int sum;
Cout<<”Type a number:”;
Cin>>x;
Cout<<”Type another number:”;
Cin>>y;
Sum=x+y;
Cout<<”The sum is:”<<sum;
Return 0;
}
11. Add the correct data type for the following variables:
myNum =9;int
myDoubleNum =8.99;float
myLetter =’A’;char
myBool =false;Boolean
myText=”Hello World”;double
 #include <iostream>
Using namespace std;
Int main()
{
Int myNum=9;
Double myDoubleNum=8.99;
 Char myLetter=‘A’;
Bool myBool=false;
String myText = “Hello World”;
Cout<< “myNum:”<<myNum<<endl;
Cout<< “myDoubleNum:”<< myDoubleNum<<endl;
Cout<< “myLetter:”<< myLetter<<endl;
Cout<< “myBool:”<< myBool<<endl;
Cout<< “myText:”<< myText<<endl;
Return 0;
}
12. create two Boolean variables,named yay and nay and add
appropriate values to them.
 #include<stdio.h>
#include<conio.h>
Void main()
{
Int a=10;
Int b=20;
If:
Int a+b=30;
Cout<<”yay”;
Else:
Cout<<”nay”;
Return 0;
 }
13. Create a greeting variable and display the value of it in c+
+.
 #include<stdio.h>
#include<conio.h>
Int main()
{
Cout<<”Hello World!”;
Return 0;
14. Multiply 10 with 5 and print the result.
 #include<stdio.h>
#include<conio.h>
Void main()
Int a=10;
Int b=5;
Int c=a*b;
Cout<<”10*5”;
Cin>>c;
Return 0;
15. Divide 10 by 5 and print the result.
 #include<stdio.h>
#include<conio.h>
Void main()
Int a=10;
 Int b=5;
Int c=ab;
Cout<<”10/5”;
Cin>>c;
Return 0;
16. Use the operator to add the value 5 to the variable x.
 {int x=10;
X+=5;
Cout<<”The new value of x is:<<x;
Return 0;
}

17. Use the correct function to print the length of thr txt
string.
String txt=”Hello”;
Cout<<__len str__;
 Int main(){
String txt:”Hello”;
Cout<<txt.length()<< txt.size()
Return 0;}
18. Access the first character (H) in myString and print the
result:
 {String myString=”Hello”;
cout<< mystrig.at(0);
 endl;
return 0;}
19. Write function to print the highest value of x and y in c++.
 #include<iostream.h>
#include<stdio.h>
Void main(){
Int x=5;
Int y=10;
Cout<<max(x,y)
Return 0;
}
20. Use the correct function to print the square root of x.
#include <iostream.h>
#include<_stdio.h__>
Void main() {
Int x =64;
Cout<<__sqrt_(x);
}
 #include<iostream>
#include<cmath>
Using namespace std;
Int main()
{
Int x=64;
 Cout<< “The square root of”<<x<< “is:”<<sqrt(x)<<endl;
Return 0;
}
21. Use the correct function to round the number 2,6 to its
nearest integer.
Floating point number.
#include<iostream.h>
#include<___>
Void main(){
Cout<<___(2,6);
}
 #include<iostream>
#include<cmath>
Using namespace std;
Int main()
{
Float number = 2.6;
Cout<< “The rounded value of”<<number<<
“is:”<<round(number)<<endl;
Return 0;
}
22. Fill in the missing parts to print the values 1(for true) and
0 (for false);
…
23. Print “Hello World” if x is greater than y:
Int x=50;
Int y=10;
__if x>y;_
Cout<<”Hello world”;
 #include <iostream>
Using namespace std;
Int main()
{
Int x = 50;
Int y = 10;
If(x>y) {
Cout<< “Hello World”;
}
Return 0;
}
24. Print “Hello World” if x is equal to y.
 #include <iostream>
Using namespace std;
Int main() {
Int x=10;
Int y=10;
If ( x==y){
Cout<< “Hello Word”;
 }
Return 0;
}
25. Print “yes” if x is equal to y, otherwise print “No”, print
both values alternately.
 #include <iostream>
Using namespace std;
Int main(){
Int x=50;
Int y=50;
If (x==y){
Cout<< “yes\n”;
}
Else{
Cout<< “No\n”;
}
Cout<< “x;”<<x<< “\n”;
Cout<< “y;”<<y<< “\n”;
Return 0;
}
26. Print “1” if x is equal to y, print “2” if x is greater than y,
otherwise print “3”.
 #include<iostream>
Using namespace std;
 Int main()
{
Int x =50;
Int y=50;
If (x==y){
Cout<< “1”;
} else if(x>y) {
Cout<< “2”;
} else {
Cout<< “3”;
}
Return 0;
}
27. Write down the syntax of switch case in c++
 Switch (variable)
{
Case1:
Break;
Case2:
Break;
Default;
}
28. Write a part of the program to print I as long I is less than
6.(While loop)
 #include<iostream.h>
Using namespce std;
Int main(){
Int i=0;
While (i<6){
Cout<< “I ”;
I++;
}
Return 0;
}
29. Use a for loop to print “Yes” 5 times.
 #include<iostream>
Using namespace std;
Int main(){
For (int i=0; i<5; i++){
Cout<< “Yes” << endl;
}
Return 0;
}
30. Write a program to stop the loop if I is 5.
 #include <iostream>
Using namespace std;
Int main(){
For (int i=0; i<10 ;i++)
 If( i==5){
Break;
}
}
Cout<< “Loop stopped at i<5.” << endl;
Return 0;
}
31. Create an array of type string called cars.
 #include<iostream>
#include<string>
Using namespace std;
Int main(){
String cars[] = {“Toyota” , “BMW” , “Audi”};
Cout<< “The first car is:”<< cars[0]<<endl;
Cout<< “The second car is:”<< cars[1]<<endl;
Cout<< “The third car is:”<< cars[2]<<endl;
Return 0;
}
32. Print the value of the second element in the cars array.
 #include <iostream>
#include <string>
Using namespace std;
Int main(){
String cars []= {“Toyota” , “BMW” , “Audi”};
 Cout<< “The second car is:”<< cars[1]<<endl;
Return 0;
}
33. Create a reference variable named meal,which should be
a reference to food variable.
 #include <iostream>
#include <string>
Using namespace std;
Int main() {
String food= “Pizza”;
String meal= food;
Cout<< “The meal is:” <<meal <<endl;
Return 0;
}
34. Get the memory address of the variable of the food
variable:
 #include <iostream>
#include <string>
Using namespace std;
Int main() {
String food = “Pizza”;
Cout<< “The memory address of ‘food’ is:” <<&food<< endl;
Return 0;
}
 35. Use an access specifier to make members of MyClass
accessible from outside the class.
 #include<iostream>
Using namespace std;
Class MyClass {
Public:
Int myNum;
}
Int main() {
MyClass obj;
Obj.myNum =5;

Cout<< “The value of myNum is:” <<obj.myNum<< endl;

Return 0;

36. Create an object of MyClass called myObj and use it to set

the value of myNum to fifteen.
 #include <iostream>
Using namespace std;
Class MyClass {
Int myNum;
};
Int main(){
MyClass myobj;
 myObj.myNum = 15;
cout<< “The value of myNum is:” << myObj.myNum <<endl;
return 0;
}
37. Create a constructor of myClass and call it:
 #include<iostream>
Using namespace std;
Class MyClass {
Public;
MyClass() {
Cout<< “Hello World!” <<endl;
}
};
Int main() {
MyClass myobj;
Return 0;
}
38. What are the four pillars of OOPs.
 Polymorphism
Inheritance
Encapsulation
abstraction