Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #include <stdio.h>
- #include <stdlib.h>
- int isitprime(int index);
- int main()
- {
- int index;
- int result;
- for (index = 1; index <= 20; index++)
- {
- result = isitprime(index);
- if (result == 1)
- {
- printf("%d is prime\n", index);
- }
- else if (result == 0)
- {
- printf("%d is not prime\n", index);
- }
- else
- {
- printf("Something went wrong\n");
- }
- }
- return 0;
- }
- int isitprime(int index)
- {
- int i = 0;
- int divisors = 0;
- for (i = 1; i <= index; i++)
- {
- if ((index % i) == 0)
- {
- divisors++;
- }
- }
- if (divisors == 2)
- {
- return 1;
- }
- else if (divisors != 2)
- {
- return 0;
- }
- else
- {
- return -1;
- }
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement