C语言数组之素数小程序

Question

这个报错是什么意思？我是抄teacher的代码感觉没啥区别……他用的devc++

#include <stdio.h>
#include<stdlib.h>
#include<time.h>

int isprime(int x, int knownprimes[], int number0fKnownprimes)
{
return 0;
}

int isprime(int x, int knownprimes[], int number0fKnownprimes)
{
int ret = 1;
int i;
for (i = 0; i < number0fKnownprimes; i++) {
if (x%knownprimes[i] == 0) {
ret = 0;
break;
}
}
return ret;
}
int main(void)
{
const int number = 10;
int prime[number] = { 2 };
int count = 1;
int i = 3;
while (count < number) {
if (isprime(i, prime, count)) {
prime[count++] = i;
}
i ++ ;
}
for (i = 0; i<number; i++) {
printf("%d", prime[i]);
if((i+1)%5)printf("\t");
else printf("\n");
}

return 0;

}

Answer 1

你这写了两遍isprime函数啊，把return 0的那一个函数删掉