//求前n项的和，函数调用哪里错了//
#include <stdio.h>
void main()
{
    int i;
    int sum(int n);
    printf("请输入一个数:\n");
    scanf("%d",&i);
    sum(i);
    printf("前%d项的和为:%d\n",i,sum);
}
int sum(int n)
{
    int i;
    if (i==1) n=1;
    else n=sum(n-1)+n;
    return n;
}
//错误提示如下warning C4700: local variable 'i' used without having been initialized//