01 #include<stdio.h>
02 
03 int main()
04 {
05     int num;
06 
07     while(1) //always true
08     {
09         printf("nnEnter a Number ( < = 100) to find its Square .");
10         printf("nPress 0 To Exit. : ");
11         scanf("%d",&num);
12         if(num==0)
13         {
14             printf("nProgram End. Thank You");
15             break;
16         }
17         else if(num>100)
18         {
19             printf("nYou Enter number greater than 100 : Try again");
20             continue;
21         }
22 
23         printf("nSquare of %d is %d",num,(num*num));
24 
25     }
26     return 0;
27 }

 
 OUTPUT :
 
 Enter a Number ( < = 100) to find its Square .
 Press 0 To Exit. : 3
 
 Square of 3 is 9
 
 Enter a Number ( < = 100) to find its Square .
 Press 0 To Exit. : 5
 
 Square of 5 is 25
 
 Enter a Number ( < = 100) to find its Square .
 Press 0 To Exit. : 0
 
 Program End. Thank You