QT day1

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
typedef struct
{
    char *text;
    int len;

}stu;
char* fun1(stu s1,stu s2)
{
    char *p1=s1.text;
    char *p2=s2.text;
    while(*p1!=0)
    {
        p1++;
    }
    while(*p2!=0)
    {
        *p1=*p2;
        p1++;
        p2++;
    }
    *p1='\0';
    return s1.text;
}
void fun2(stu s1,stu s2)
{
    char *p1=s1.text;
    char *p2=s2.text;
    int count=1;
    while(1)
    {
        if(*p1==*p2)
        {
            if(count==s1.len&&count==s2.len)
            {
                printf("字符串s1等于字符串s2\n");
                break;
            }
            p1++;
            p2++;
            count++;

        }
        else if(*p1>*p2)
        {
            printf("字符串s1大于字符串s2\n");
            break;
        }
        else
        {
            printf("字符串s1小于字符串s2\n");
            break;
        }

    }
}
void fun3(stu s1,stu s2)
{
    strcpy(s1.text,"\0");
    strcpy(s2.text,"\0");
    s1.len=0;
    s2.len=0;
}
int main()
{
    char s1[20];
    char s2[20];
    stu ss1,ss2;
    printf("请输入s1字符串：");
    scanf("%s",s1);
   // s1[strlen(s1)-1]='\0';
    ss1.text=s1;
    ss1.len=strlen(s1);
    printf("请输入s2字符串：");
    scanf("%s",s2);
    //s2[strlen(s2)-1]='\0';
    ss2.text=s2;
    ss2.len=strlen(s2);
    printf("s1的首地址：%p\n",s1);
    printf("s2的首地址：%p\n",s2);
    fun2(ss1,ss2);
    printf("s1+s2=%s\n",fun1(ss1,ss2));

    fun3(ss1,ss2);
    return 0;
}