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//program to check whether a number is prime or not using while statement #include<stdio.h> #include<conio.h> void main() { int i=2; int a; int prime=1; clrscr(); printf("enter number to check for "); scanf("%d",&a); while(i<=a/2) { if(a%i==0) { prime=0; break; } i++; } if(prime==1) { printf("number is prime "); } else { printf("number is not prime"); } getch(); }