指针法实现输入3个字符串并按由小到大顺序输出

用指针法实现输入3个字符串，按由小到大顺序输出。#include "stdio.h"

#include "string.h"

int main()

{char *t;

char *p1=NULL,*p2=NULL,*p3=NULL;

char ch1[20]={0},ch2[20]={0},ch3[20]={0};

p1=ch1; p2=ch2; p3=ch3;

printf("No1:");

scanf("%s",p1);

printf("No2:");

scanf("%s",p2);

printf("No3:");

scanf("%s",p3);

if(strcmp(p1,p2)>0)

{t=p1;p1=p2;p2=t;}

if(strcmp(p1,p3)>0)

{t=p1;p1=p3;p3=t;}

if(strcmp(p2,p3)>0)

{t=p2;p2=p3;p3=t;}

printf("%s\n%s\n%s\n",p1,p2,p3);

return 0;

}