Loop statement In C Language | Loop statement In C Language In Hindi

Loop statement In C Language

Loop are used to repeat a block of statement for a certain time.

There are three type of loop they are:

1.while loop

2.do-while loop

3.for loop

1.while loop

This loop execute a statement or a block of statement until the specified Boolean expression evaluates to false.

Syntax:

While(expression)

{

//statement

}

Fig: While loop 

Program

#include<stdio.h>

#include<conio.h>

void main()

{

int   i=1;

while(i<=5)

{

printf(“%d\n”,i);

i++;

}

getch();

}

Output:

1

2

3

4

5

2.do-while loop

This loop execute a statement or a block of statement until the specified Boolean expression evaluates to false.

Syntax:

do

{

//statement

}

while(expression);

Fig: do-while loop 

Program

#include<stdio.h>

#include<conio.h>

void main()

{

char choice=’Y’;

do

{

int    number=5;

printf(“\n print number :%d”,number);

printf(“\n Do you want to Continue (y/n)   :”);

scanf(“%c”, &choice);

}

while(choice==’y’);

getch();

}

Output:

Print number :5

Do you want to continue (y/n) : y

3. for loop

This loop has three sections-index declaration, condition(Boolean expression) and updating section, in each for loop iteration the index is update(incremented/decremented)  by updating section and checked with condition. 

If the condition is matched, it continue execution until the specified Boolean expression evaluates to false.

Syntax:

for(initialization statement, condition, increment/decrement)

{

//statement;

}

Fig: for loop 

Program

#include<stdio.h>

#include<conio.h>

void main()

{

int   a,f,i;

printf(“Enter a number :  “);

scanf(“%d”,&a);

f=1;

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

f=f*i;

printf(“factorial  : %d”, f);

getch();

}

Output:

Enter a number :5

Factorial: 120