C++中4种方式把字符串和数字连接起来

阳光穿透心脏的1/2处 2023-12-03 06:12 70阅读 0赞

原文链接:[https://blog.csdn.net/program\_anywhere/article/details/63720261][https_blog.csdn.net_program_anywhere_article_details_63720261]

以前老用Java里面的String类，用过的人都知道好舒服，连接字符串和数字只需要用一个 + 号就可以了。在这里真的想把C++中string类+号功能加强一下。希望有能力的人可以做一下，不然总是感觉string类缺点啥呢（每次都和java比 O(∩\_∩)O哈哈~）  
不废话了，如题直接晒代码

#include <iostream>
    #include <string>
    #include <cstdlib>
    #include <sstream>
    #include <cstring> 
    using namespace std;
    
    //第一种C风格的转化(以前一直喜欢的  sprintf 功能强大)
    void test()
    {
        char *s = "dong";
        int a = 52;
        float b = .1314;
        char *buf = new char[strlen(s) + sizeof(a) + 1];
        sprintf(buf, "%s%d%.4f", s, a, b);
        printf("%s\n", buf);
    }
    //半C半C++风格
    void test1()
    {
        string s = "dong";
        int a = 520;
        char *buf = new char[10];//2147483647 int最大值
        _itoa(a, buf, 10);      //itoa虽然可以转化为各种进制，但是注意不能是float或者double
        cout << s + buf << " | ";
        _itoa(a, buf, 16);
        cout << s + buf << endl;
    }
    //纯C++风格
    void test2()
    {
        string s = "陈明东";
        int a = 52;
        double b = .1314;
        ostringstream oss;
        oss << s << a << b;
        cout << oss.str() << endl;
    }
    //C++11新特性
    void test3()
    {
        int a = 520;
        float b = 5.20;
        string str = "dong";
        string res = str + to_string(a);
        cout << res << endl;
        res = str + to_string(b);
        res.resize(8);
        cout << res << endl;
    }
    int main()
    {
        test();
        test1();
        test2();
        test3();
        return 0;
    }
    /*
    dong520.1314
    dong520 | dong208
    陈明东520.1314
    dong520
    dong5.20
    */

[https_blog.csdn.net_program_anywhere_article_details_63720261]: https://blog.csdn.net/program_anywhere/article/details/63720261