#include stdio.h
int main()
{
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
if (n == 0 || n == 1)
flag = 1;
for (i = 2; i = n / 2; ++i) {
if (n % i == 0)
{
flag = 1;
break;
}
}
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
return 0;
}
Take integer as : "89"
