C++类中要怎样调用字符串？为什么输出是这样的结果？

Question

/*定义一个Dog类，包含age,weight等属性，以及对这些属性操作的方法
实现并测试这个类*/

#include <iostream>
#include <string.h>
#define N 10 
using namespace std;

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

class Dog{
    public:
        void Age(int a);
        void Weight(int b);
        void Haircolor(char s[N]);
    private:
        int x,y;
        char c[N];
}; 
void Dog::Age(int a){
    x=a;
    cout<<"age="<<x<<endl;
}
void Dog::Weight(int b){
    y=b;
    cout<<"weight="<<y<<endl;
}
void Dog::Haircolor(char s[N]){
    int i=0,n=0;
    strcat(c,s);
    n=strlen(c);
    cout<<"Haircolor=";
    while((i++)<n){
        cout<<c[i];
    }
}
int main(int argc, char** argv) {
    Dog mydog;       //定义对象mydog
    int x=0,y=0;
    char c[N];
    cin>>x>>y;
    cin>>c[N];
    mydog.Age(x);
    mydog.Weight(y);
    mydog.Haircolor(c);
    return 0;
}
```![图片说明](https://img-ask.csdn.net/upload/202003/20/1584669498_184479.png)

Answer 1

#include <iostream>
#include <string.h>
#define N 10 
using namespace std;

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

class Dog{
    public:
        void Age(int a);
        void Weight(int b);
        void Haircolor(char s[N]);
    private:
        int x,y;
        char c[N];
}; 
void Dog::Age(int a){
    x=a;
    cout<<"age="<<x<<endl;
}
void Dog::Weight(int b){
    y=b;
    cout<<"weight="<<y<<endl;
}
void Dog::Haircolor(char s[N]){
    int i=0,n=0;
    c[0] = 0;
    strcat(c,s);
    n=strlen(c);
    cout<<"Haircolor=";
    while(i<n){
        cout<<(char)c[i++];
    }
}
int main(int argc, char** argv) {
    Dog mydog;       //定义对象mydog
    int x=0,y=0;
    char c[N];
    cin>>x>>y;
    cin>>c;
    mydog.Age(x);
    mydog.Weight(y);
    mydog.Haircolor(c);
    return 0;
}