IT. Expert System.

The while statement is also a looping statement. the while loop evaluates the test expression before every loop, so it can execute zero times if the condition is initially false

Syntax:

while (expression)
        {
        statement 1;
        statement 2; 
        …………...
        statement n;
       }

Example:

#include 
     int main(){
     int number,factorial;
     printf("Enter a number.\n");
     scanf("%d",&number);
     factorial=1;
     while (number>0){      /* while loop continues util test condition number>0 is true */
           factorial=factorial*number;
           --number;
}
printf("Factorial=%d",factorial);
return 0;
}
Output

Enter a number.
5
Factorial=120

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