要怎么输出图中的中文

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上图输出后要怎么才能出现下图的内容?怎么添加语句?
要怎么输出以下内容?

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#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main() {
    string str;
    cout << "输入一个字符串:";
    getline(cin, str);
    cout << "----------------" << endl;
    cout << "原始字符串为:" << endl;
    cout << str << endl;
    cout << "修改后的字符串为:" << endl;
    for (int i = 0; i < str.size(); i++) {
        if (isalpha(str[i])) {
            if (islower(str[i])) {
                str[i] = toupper(str[i]);
            }else{
                str[i] = tolower(str[i]);
            }
        }
    }
    cout << str << endl;
    return 0;
}

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