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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5.     int n, i, flag = 1;
  6.  
  7.     printf("Enter an integer: ");
  8.     scanf("%d", &n);
  9.  
  10.     if (n <= 1)
  11.     {
  12.         flag = 0;
  13.     }
  14.     else
  15.     {
  16.         for (i = 2; i*i<= n; i++)
  17.         {
  18.             if (n % i == 0)
  19.             {
  20.                 flag = 0;
  21.                 break;
  22.             }
  23.         }
  24.     }
  25.  
  26.     if (flag == 1)
  27.     {
  28.         printf("%d it is a Prime Number.", n);
  29.     }
  30.     else
  31.     {
  32.         printf("%d it is not a Prime Number.", n);
  33.     }
  34. }
  35.  
  36.  
  37.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin
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23
stdout
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Enter an integer: 23 it is a Prime Number.
https://ideone.com/lOuvZK
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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