素数和

 1 #include<stdio.h>
 2 
 3 int main(void)
 4 {
 5     int n, m;
 6     int i;
 7     int isPrime;
 8     int sum;
 9     int count;
10 
11     i = 2;                        //第一个素数
12     sum = 0;
13     count = 0;                    //符合条件的素数个数
14     scanf_s("%d %d", &n, &m);
15 
16     do
17     {
18         isPrime = 1;
19 
20         for (int j = 2; j < i; j++)
21         {
22             if (i % j == 0)
23             {
24                 isPrime = 0;
25                 break;
26             }
27         }
28 
29         if (isPrime)
30         {
31             count++;
32 
33             if (count >= n)
34             {
35                 sum = sum + i;
36             }
37         }    
38 
39         i++;
40     } while (count < m);
41 
42     printf("%d\n", sum);
43 
44     return 0;
45 }