p5.c

  1 #include <stdio.h>
  2 #define TRUE 1
  3 #define FALSE 0
  4
  5 _Bool check_if_prime(unsigned int);
  6
  7 int main(void)
  8 {
  9         unsigned int number_of_primes, test_int, input, latest_prime;
 10         _Bool isPrime;
 11
 12         number_of_primes = 0;
 13         test_int = 1;
 14
 15         printf("For which prime number do you want to know the value?\n");
 16         scanf("%u", &input);
 17
 18         do
 19         {
 20                 test_int++;
 21                 isPrime = check_if_prime(test_int);
 22                 if(isPrime == TRUE)
 23                 {
 24                         number_of_primes++;
 25                         latest_prime = test_int;
 26                 }
 27         }
 28         while(number_of_primes < input);
 29
 30         printf("The prime number is %u\n", latest_prime);
 31
 32         return 0;
 33 }
 34

 35 _Bool check_if_prime(unsigned int test_int)
 36 {
 37         unsigned int div;
 38         _Bool isPrime;
 39
 40         isPrime = TRUE;
 41         for(div = 2; div < test_int; div++)
 42         {
 43                 if(test_int%div==0)
 44                 {
 45                         isPrime = FALSE;
 46                         break;
 47                 }
 48         }
 49         return isPrime;
 50 }
 51