c语言简单编程

String 1~5 sorting
• char string1[20] = "abc";
• char string2[20] = "1";
• char string3[20] = "Hello world!"; • char string4[20] = "good";
• char string5[20] = "1500-1234";
求代码、

 #include<stdio.h>
#include<string.h>
void main ()
{
    char string1[20] = "abc";
    char string2[20] = "1";
    char string3[20] = "Hello world!";
    char string4[20] = "good";
    char string5[20] = "1500-1234";

    char *p[5],*tp;
    int i,j;
    p[0]=string1;
    p[1]=string2;
    p[2]=string3;
    p[3]=string4;
    p[4]=string5;

    for(i=0;i<=3;i++)
    {
        for(j=i+1;j<=4;j++)
        {
            if(strlen(p[i])>strlen(p[j]))
            {
                tp=p[i]; p[i]=p[j]; p[j]=tp;
            }
        }
    }
    for(i=0;i<5;i++)
        printf("%s\n",p[i]);
}

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

int cmp(const void * a, const void * b)
{
    return strlen((char *)a) - strlen((char *)b);
}

int main(void)
{
    char data[5][20] = { "abc", "1", "Hello world!", "good", "1500-1234" };
    qsort(data, 5, sizeof(char[20]), cmp);
    int i;
        for (i = 0; i < 5; i++)
        printf("%s\n", data[i]);
    return 0;
}

1
abc
good
1500-1234
Hello world!

http://codepad.org/ClcKdadE