Loops in C language #1

Loops 
 

          In looping, sequence of statement are executed until some conditions for the termination of the loop are satisfied. A program loop therefore consist of two segments, one known as the body of the loop and other known as the control statement.

In C there are 4 loops as follow:

1. for loop
2. while loop
3. do while loop

1. for loop

syntax of for loop

for(initialization; condition; increment/decrement)

   {

     statement;

      ...............

      ...............

      ...............

   }

     

Example of for loop.

#include<stdio.h>#include<conio.h>
int main()
{
   int a=10, i;
   clrscr();
   for(i=1; i<=a; i++)
   {
     printf("%d\n",a);
   }
   return0;
}

Ouput:-
1
2
3
4
5
6
7
8
9
10

Explanation:- 

     for(i=1; i<=a; i++) in this for loop i=1 is initial value of i, i<=a means value of i is from 1 to 10 because value of a is 10, and i++ is increase value by 1.

same program using decrement sign 
   
#include<stdio.h>
#include<conio.h>
int main()
{
   int a=10, i;
   clrscr();
   for(i=a; i>=1; i--)
   {
     printf("%d\n",a);
   }
   return0;
}

Output:-

10

9

8

7

6

5

4

3

2

1

Explanation:-
i-- is decrease the value of i by 1.

If any doubt or query comment below......

In next blog we will learn further loops. 

Key Note:- when we use int main as main function then instead of getch() use return0; both have same function.