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  1. #include <stdio.h> 
  2. int main() { 
  3.     int n, i, flag = 1; 
  4.     printf("Enter a number: "); 
  5.     scanf("%d", &n); 
  6.     for(i = 2; i <= n/2; i++) { 
  7.         if(n % i == 0) { 
  8.             flag = 0; 
  9.             break; 
  10.         } 
  11.     } 
  12.     if(n <= 1) flag = 0; 
  13.     if(flag) printf("%d is prime\n", n); 
  14.     else printf("%d is not prime\n", n); 
  15.     return 0; 
  16. }
  17.  
  18.  
  19.  
Success #stdin #stdout 0.01s 5308KB
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stdin
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53
stdout
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Enter a number: 53 is prime
https://ideone.com/CRFweS
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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