问题应该不是你描述的那样
1. 为啥用中文命名文件?
2. 把代码贴出来看看，错误信息贴出来看看
3. qsort()是c的，sort()才是cpp的，两者的原型也不一样
4. qsort()里面
struct person pa = *(struct person *)a;
估计是你抄错了，至少也应该是
struct person *pa = (struct person *)a
后面也把 . 换成 ->
5. 其他的先把代码和错误信息贴出来再看

C.人口普查
#include<stdio.h>
#include<stdlib.h>struct person {
char name[5];
int year, month, day;
int flag;
}People[10000];
int comp(const void *a, const void *b) {
struct person *pa = (struct person *) a;
struct person *pb = (struct person *) b;
if (pa->year != pb->year)
return pa->year - pb->year;
else if (pa->month != pb->month)
return pa->month - pb->month;
else
return pa->day - pa->day;
}
int main()
{
int count = 0, N, i; scanf("%d", &N);
for (i = 0; i < N; i++) {
scanf("%s %d/%d/%d", People[i].name, &People[i].year, &People[i].month, &People[i].day);
if (People[i].year < 2014 && People[i].year > 1814) {
People[i].flag = 1;
count++;
}
else if (People[i].year == 2014) {
if (People[i].month < 9) {
People[i].flag = 1;
count++;
}
else if (People[i].month == 9) {
if (People[i].day <= 6) {
People[i].flag = 1;
count++;
}
else
People[i].flag = 0;
}
else
People[i].flag = 0; }
else if (People[i].year == 1814) {
if (People[i].month > 9) {
People[i].flag = 1;
count++;
}
else if (People[i].month == 9) {
if (People[i].day >= 6) {
People[i].flag = 1;
count++;
}
else
People[i].flag = 0;
}
else
People[i].flag = 0;
}
else
People[i].flag = 0;
}
qsort(People, N, sizeof(struct person), comp);
i = 0;
printf("%d ", count);
while (People[i].flag == 0)
i++;
printf("%s %s", People[i].name, People[i + count - 1].name); return 0;
}