#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define M 15
struct system{
    char name[M];
    int wage;
    struct system *next;
};
int main (void)
{
    struct system *head=NULL;
    struct system *prev,*current;
    char input [M];
    puts("请输入员工姓名：");
    while(gets(input)!=NULL&&input[0]!='\0')
    {
        current=(struct system *)malloc(sizeof(struct system));
        if(head==NULL)
            head=current;
        else
            prev->next=current;

        current->next=NULL;
        strcpy(current->name,input);
        puts("请输入你的工资：");
        scanf("%d",&current->wage);
        while(getchar()!='\n')
            continue;
        puts("请输入下个员工姓名:");
        prev=current;
    }
    if(head==NULL)
        printf("没有输入数据");
    else
        printf("下面是输出数据\n");
    current=head;
    while(current!=NULL)
    {
        printf("姓名：%s  工资：%d\n",current->name,current->wage);
        current=current->next;
    }
/*这个位置如果添加了一个“current=head;”为什么就不能正常运行了*/
    while(current!=NULL)
    {
        free(current);
        current=current->next;
    }
    printf("ok!");
    return 0;
}

不懂