C风格字符串的越界异常处理

#include <iostream>
#include <cstring>
using namespace std;
class MyStr{
    char str[200];
public:
    void set(string str);
    char at(unsigned int a);
};
void MyStr::set(string str){
    strcpy(this->str,str.c_str());
}
char MyStr::at(unsigned int a){
    if(strlen(str)<=a){
        throw int(2);
    }
        return str[a];

}
int main()
{

    MyStr s1;
    int n=0;
    s1.set("longthim");
    cin >> n;
    try {
        cout << s1.at(n) << endl;
    } catch (int) {
        cout << "越界访问" << endl;
        return -1;
    }
    return 0;
}

 

#include <iostream>

using namespace std;
class Figure{
    int n;
public:
    Figure():n(0){}
    void MyGetChar();
};
class Alpha{
    char ch;
public:
    Alpha():ch('a'){}
    void MyGetChar();
};
void Figure::MyGetChar(){
    if(n<=9){
        cout << n ;
        n++;
    }
}
void Alpha::MyGetChar(){
    if(ch<='z'){
        cout << ch;
        ch++;
    }
}
int main()
{
    Figure f1;
    Alpha a1;
    for(int i=0;i<26;i++){
        f1.MyGetChar();
        a1.MyGetChar();
    }
    return 0;
}