#include<stdio.h>
int main(){
    int val,i,onuser = 0,one = 0,two = 0,three = 0,num[100];
    printf("please input the number of electorate:\n");
    scanf("%d",&val);
    printf("please input 1or2or3\n");
    for(i = 0;i < val;i++)
    {
        scanf("%d",num[i]);
        if(num[i] == 1)
            one++;
        if(num[i] == 2)
            two++;
        if(num[i] == 3)
            three++;
        else
            onuser++;            
    }
    printf("The result:\n");
    printf("canfidate1:%d",one);
    printf("canfidate2:%d",two);
    printf("canfidate3:%d",three);
    printf("onuser:%d",onuser);            
}

scanf("%d",num[i]);-> scanf("%d",&num[i]);

，我太佩服我自己了，看了几遍以为是逻辑错误。。谢了