刚学三天只学到循环代码简化

Question

mooc上的题求简化我的代码，mooc上的题求简化我的代码，mooc上的题求简化我的代码，mooc上的题求简化我的代码。

Answer 1

#include

int isPrime(long n);

int main(int argc, char const *argv[])
{
int n, m, count;
long l, sum;

while(1) {
    scanf("%d%d", &n, &m);        
    if (n > 0 && n <= m && m <= 200) break;
    printf("Invalid input, try again.\n");
}    

count = 0; sum = 0; l = 2;
do {
    if (isPrime(l)) {
        count ++;
        if (count >= n) sum += l;
    }        
    l++;
} while (count < m);
printf("%d\n", sum);

return 0;

}

int isPrime(long n)
{
int i;

if (n == 2)
    return 1;

for (i = 2; i*i <= n;i++)
    if (n % i == 0)
         return 0;

 return 1;

}