Question

How to calculate the first N (random up to 100) prime numbers in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
int main(void)
{
	int i, n, prime = 3, numbers;
 
	srand(time(NULL));
	n = rand() % 100 + 1;
 
	if ( n >= 1 )
	{
      printf("First %d prime numbers are :\n", n);
      printf("2\n");
	}
 
   for (numbers = 2 ; numbers <= n ; )
   {
      for (i = 2 ; i <= prime - 1 ; i++)
      {
         if (prime % i == 0)
            break;
      }
      if (i == prime)
      {
         printf("%d\n", prime);
         numbers++;
      }
      prime++;
   }

   return 0;
}

 
/*
   
run:
   
First 41 prime numbers are :
2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
101
103
107
109
113
127
131
137
139
149
151
157
163
167
173
179

*/

 

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