Looping Statement In C++ | Loop Statement In C++ Programming | Looping Statement In C++ Example | Explain Looping Statement In C++ | Looping Statement In C++ In Hindi

Looping Statement In C++ 

Loops in programming come into use when we need to repeatedly execute a block of statements.

 

There are mainly two types of loops:

1.    Entry Controlled loops:

In this type of loops the test condition is tested before entering the loop body. For Loop and While Loop are entry controlled loops.

 

2.    Exit Controlled Loops:

  In this type of loops the test condition is tested or evaluated at the end of loop body. Therefore, the loop body will execute atleast once, irrespective of whether the test condition is true or false. do – while loop is exit controlled loop.

 

Fig: Loop Statement In C++

   1.    For loop  

   2.    Do-while loop

   3.    While loop

 

1.    For loop

A for loop is a repetition control structure which allows us to write a loop that is executed a specific number of times. The loop enables us to perform n number of steps together in one line.

Syntax:

for(initialization; condition;incr/decr)

{

//statement;

}

Fig: For Loop Statement In C++

Program:

#include<iostream.h>

#include<conio.h>

void main()

{

int a;

for(a=1;a<=5;a++)

{

cout<<”the number enter is :”;

}

getch();

}

 

Output:

The number enter is: 1

The number enter is: 2

The number enter is: 3

The number enter is: 4

The number enter is: 5

 

 

 2.   While loop 

In C++, the loop is used several times for the iteration of a part of the program. If the iteration number is not set, it is advisable to use the loop rather than the loop.

Synatx:

While(condition)

{

//statement;

}

Fig: While Statement In C++

 

Program:

#include<iostream.h>

#include<conio.h>

void main()

{

int a,b;

cout<<”enter any no for table”;

cin>>a;

b=1;

while(b<=10)

{

cout<<a*b;

b++;

}

getch();

}

Output:

Enter any no for table 2

4

6

8

10

12

14

16

18

20

 

3.    Do-while loop

In do while loops also the loop execution is terminated on the basis of test condition. The main difference between do while loop and while loop is in do while loop the condition is tested at the end of loop body, i.e do while loop is exit controlled whereas the other two loops are entry controlled loops.

Syntax:

do

{

//statement;

}

while(condition);

 

Fig: Do While Statement in c++

Program:

#include<iostream.h>

#include<conio.h>

void main()

{

int a,fact;

cout<<”enter number”;

cin>>a;

fact=1;

do

{

fact=fact*a;

a--;

}

while(a>=1);

cout<<”the factorial value “<<endl;

getch();

}

Output:

Enter number

4

The factorial value 24