Here is the general form of the while loop in C.
while(condition)
{
statements;
}
As you can see, when the condition is true, then the while loop's statements will be executed, otherwise not. Now go through the following example that illustrates the while loop.
Here is a while loop example program in C programming.
/* C while loop example program */
#include<stdio.h>
#include<conio.h>
void main()
{
int num = 2;
int i=1;
clrscr();
while(i<=10)
{
printf("%d * %d = %d\n", num, i, num*i);
i++;
}
getch();
}
Here this program also prints the table of 2 but using the while loop, below is the sample output of this C program.
Here is one more example program that illustrates the concept of while loop in C programming.
/* C while Loop Example
* This program illustrates the concept
* of while loop in C programming
*/
#include<stdio.h>
#include<string.h>
#include<conio.h>
void pad(char *str, int len);
void main()
{
char str[80];
clrscr();
strcpy(str, "this is a test");
pad(str, 50);
printf("%d", strlen(str));
getch();
}
/* adding spaces to the end of the string
* to fill the string to a predefined length
*/
void pad(char *str, int len)
{
int l;
l=strlen(str);
while(l<len)
{
str[l] = ' ';
l++;
}
str[l] = '\0';
}
Below is the sample run of this program
