#include<stdio.h>
#include<string.h>
typedef struct census
{
    char city[20];
    long population;
    double culture;
}A;
main()
{
    A city[]={
        {"Beijing",100000,3.0},
        {"Jinan",10000,3.1},
        {"New york",10000000,3.2},
        {"Boshan",1000,3.5}};
    int index;
    void line(A,int);
    index=sizeof(city)/sizeof(A);
    line(city,index);
}
 void line(A line[],int index)
{
    int i,j;
    A a;
    for(i=0;i<index-1;i++)
    {
        for(j=i+1;j<index;j++)
            if(strcmp(line[i].city,line[j].city)>0)
            {
                a=line[i];
                line[i]=line[j];
                line[j]=a;
            }
    }
    for(i=0;i<index;i++)
        printf("%s  %d  %f",line[i].city,line[i].population,line[i].culture);
}

#include<stdio.h>
#include<string.h>


typedef struct census
{
    char city[20];
    long population;
    double culture;
}A;

void line_a(A line[],int index); // 声明函数
main()
{
    A city[]={
        {"Beijing",100000,3.0},
        {"Jinan",10000,3.1},
        {"New york",10000000,3.2},
        {"Boshan",1000,3.5}};
    int index;
    void line(A,int);
    index=sizeof(city)/sizeof(A);
    line_a(city,index);
}
void line_a(A line[],int index) // 函数名不能和参数名一样
{
    int i,j;
    A a;
    for(i=0;i<index-1;i++)
    {
        for(j=i+1;j<index;j++)
            if(strcmp(line[i].city,line[j].city)>0)
            {
                a=line[i];
                line[i]=line[j];
                line[j]=a;
            }
    }
    for(i=0;i<index;i++)
        printf("%s  %d  %f",line[i].city,line[i].population,line[i].culture);
}

在main函数中void line(A,int);与下面函数void line_a(A line[],int index)，是不是不一样呢？main中第一个参数是A，你下面定义函数是第一个参数却是A类型的数组

谢谢

谢谢

谢谢