C language loops | while loop

More examples of while loop

While Set 1:Q1-Q10    While Set 2:Q11-Q20    While Set 3:Q21-Q30

For Loop      While Loop      Do while Loop

While loop

Syntax :

while(condition)
{
statements;
statements;
statements;
}

* While loop is an entry control loop.
* In while loop the condition is checked first and then the statements of the loop are executed.
* In while loop if the specified condition is true then only the control enters the loop otherwise not.

While loop examples:

Example:1
Write a C program to print numbers from 1 to 10
Sol:

#include <stdio.h>
 int main()
 {
     int i=1;
     while(i<=10)
     {
         printf("%d\n",i);
         i++;
     }
 return 0;
 }

Output:

1
2
3
4
5
6
7
8
9
10

Example:2
Write a C program to print numbers from 1 to 10 in reverse order
Sol:

#include<stdio.h>
 int main()
 {
     int i=10;
     while(i>=1)
     {
         printf("%d\n",i);
         i--;
     }
 return 0;
 }

Output:

10
9
8
7
6
5
4
3
2
1

Example:3
Write a C program to print all even numbers from upto 20
Sol:

#include<stdio.h>
 int main()
 {
     int i=2;
     while(i<=20)
     {
         printf("%d\n",i);
         i=i+2;
     }
 return 0;
 }

Output:

2
4
6
8
10
12
14
16
18
20

Example:4
Write a C program to print alll even numbers from upto 20 in reverse order
Sol:

#include<stdio.h>
 int main()
 {
     int i=20;
     while(i>=2)
     {
         printf("%d\n",i);
         i=i-2;
     }
 return 0;
 }

Output:

20
18
16
14
12
10
8
6
4
2

Example:5
Write a C program to print alll odd numbers from upto 25
Sol:

#include<stdio.h>
 int main()
 {
     int i=1;
     while(i<=25)
     {
         printf("%d\n",i);
         i=i+2;
     }
 return 0;
 }

Output:

1
3
5
7
9
11
13
15
17
19
21
23
25

For Loop      While Loop      Do while Loop

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