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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n, is_prime = 1;
  5.  
  6.     printf("Enter n: ");
  7.     scanf("%d", &n);
  8.  
  9.     if (n <= 1) {
  10.         is_prime = 0;
  11.     } else {
  12.         for (int i = 2; i * i <= n; i++) {
  13.             if (n % i == 0) {
  14.                 is_prime = 0;
  15.                 break;
  16.             }
  17.         }
  18.     }
  19.  
  20.     if (is_prime) {
  21.         printf("PRIME\n");
  22.     } else {
  23.         printf("NOT PRIME\n");
  24.     }
  25.  
  26.     return 0;
  27. }
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
Enter n: NOT PRIME
https://ideone.com/g3jc1t
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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