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  1. #include <stdio.h>
  2. #include <math.h>
  3. int main()
  4. {
  5.   int n, i, flag=0;
  6.   printf("Enter a positive integer: ");
  7.   scanf("%d",&n);
  8.   for(i=2;i<=sqrt(n);++i)
  9.   {
  10.       if(n%i==0)
  11.       {
  12.           flag=1;
  13.           break;
  14.       }
  15.   }
  16.   if (flag==0)
  17.       printf("%d is a prime number.",n);
  18.   else
  19.       printf("%d is not a prime number.",n);
  20.   return 0;
  21. }
Success #stdin #stdout 0s 2160KB
comments (?)
stdin
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3301
stdout
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Enter a positive integer: 3301 is a prime number.
https://ideone.com/Sp58lL
language:
C (gcc 8.3)
created:
9 years ago
visibility:
secret

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