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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n, i, isPrime = 1;
  5.     printf("Enter a number:\n ");
  6.     scanf("%d", &n);
  7.  
  8.     if (n <= 1) isPrime = 0;
  9.     else {
  10.         for (i = 2; i * i <= n; i++) {
  11.             if (n % i == 0) {
  12.                 isPrime = 0;
  13.                 break;
  14.             }
  15.         }
  16.     }
  17.  
  18.     if (isPrime) printf("%d is Prime\n", n);
  19.     else printf("%d is not Prime\n", n);
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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7
stdout
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Enter a number:
 7 is Prime
https://ideone.com/hAUVB5
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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