#include<stdio.h>
#include<string.h>
void sort(char *a[], int n)
{
    int i, j, m = 0;
    char **p, t;
    p = a + 0;
    for (i = 0; i < n - 1; i++)
    {
        m = i;
        for (j = i + 1; j < n; j++)
            if (strcmp(p[m], p[j]) > 0)
                m = j;
        if (m != i)
        {
            t = *p[i];
            *p[i] = *p[m];
            *p[m] = t;
        }
    }
}

void print_string(char *a[], int n)
{
    int i;
    char **p;
    p = a;
    for (i = 0; i < n; i++, p++)
        printf("%s\n", *p);
}

int main()
{
    void sort(char *a[], int n);
    void print_string(char *a[], int n);
    char *a[3] = { "Holle","Welcome","Cart" };
    sort(a, 3);
    print_string(a, 3);
    return 0;
}

装了vs2017 rc后的第一弹

顺便问一下，我不想在主函数中输入字符串，自己写一个函数怎么用这个字符串数组指针

指针数组指向的字符串常量，不能更改，所以排序时无法交换，排序函数修改如下即可：
void sort(char *a[], int n)
{
    int i, j, m = 0;
    char **p, *t;
    p = a + 0;
    for (i = 0; i < n - 1; i++)
    {
        m = i;
        for (j = i + 1; j < n; j++)
            if (strcmp(p[m], p[j]) > 0)
                m = j;
        if (m != i)
        {
            t = p[i];
            p[i] = p[m];
            p[m] = t;
        }
    }
}

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

void sort(char *a[], int n)
{
    int i, j, m = 0;
    char **p, *t;
    p = a + 0;//a+0是什么意思？
    for (i = 0; i < n - 1; i++)
    {
        m = i;
        for (j = i + 1; j < n; j++)
            if (strcmp(p[m], p[j]) > 0)
                m = j;
        if (m != i)
        {
            t = p[i];//楼主的循环不是为了字符排序 应是字符串排序吧？
            p[i] = p[m];
            p[m] = t;
        }
    }
}

void print_string(char *a[], int n)
{
    int i;
    char **p;
    p = a;
    for (i = 0; i < n; i++, p++)
        printf("%s\n", *p);
}

int main()
{
    void sort(char *a[], int n);
    void print_string(char *a[], int n);
    char *a[3] = { "Holle","Welcome","Cart" };
    sort(a, 3);
    print_string(a, 3);
    return 0;
}

#include<stdio.h>
#include<string.h>
#define N 3
char b[N][20];

void sort(char *a[], int n)
{
    int i, j, m = 0;
    char **p, *t;
    p = a + 0;
    for (i = 0; i < n - 1; i++)
    {
        m = i;
        for (j = i + 1; j < n; j++)
            if (strcmp(p[m], p[j]) > 0)
                m = j;
        if (m != i)
        {
          t = p[i];
          p[i] = p[m];
          p[m] = t;
        }
    }
}

void print_string(char *a[], int n)
{
    int i;
    char **p;
    p = a;
    for (i = 0; i < n; i++)
        printf("%s\n", p[i]);
}

void func(void)
{
    int i = 0;
    for(i = 0; i < N; i++)
    {
        gets(b[i]);
    }
}    

int main()
{
    int i = 0;
    void sort(char *a[], int n);
    void print_string(char *a[], int n);
    void func();
    //char b[3][20] = { "Holle","Welcome","Cart" };
    char *a[3];
    for(i = 0; i < N; i++)
    {
        a[i] = b[i];
    }
    func();
    sort(a, N);
    print_string(a, N);
    return 0;
}

[此贴子已经被作者于2017-1-16 19:58编辑过]

#include<stdio.h>
#include<string.h>
void sort(char *a[], int n)
{
    int i, j, m = 0;
    char **p, *t;                 //这里t应该是指针
    p = a + 0;
    for (i = 0; i < n - 1; i++)
    {
        m = i;
        for (j = i + 1; j < n; j++)
            if (strcmp(p[m], p[j]) > 0)
                m = j;
        if (m != i)
        {
            t = p[i];              //这里取指针交换
            p[i] = p[m];           //同上
            p[m] = t;
        }
    }
}

//

[此贴子已经被作者于2017-1-16 22:53编辑过]