如何在C ++中连接字符串和整数？ [英] How do you concatenate strings and integers in C++?

问题描述

我想连接字符串和整数如下：

  #includeTruck.h
＃ include< string> 
 #include< iostream> 
 
 using namespace std; 
 
 Truck :: Truck（string n，string m，int y）
 {
 name = n; 
 model = m; 
 year = y; 
 miles = 0; 
} 
 
 string Truck :: toString（）
 {
 
 string truckString =制造商名称：+名称+ +模型+，模型年：+年，里程：+英里; 
 return truckString; 
} 
  

我收到此错误：

 错误：对二进制表达式的操作数无效（'basic_string< char，std :: char_traits< char>，std :: allocator< char>>'
 'int'）
 string truckString =制造商名称：+名称+，型号名称：+ model +，型号年份：+ year，Miles ... 
  
 
 
 
任何想法我可能做错了吗？我是C ++的新手。
解决方案
在其他人提到的C ++ 03中，你可以使用 ostringstream  >< sstream> ：
  std :: ostringstream stream; 
 stream< <混合数据，像这样int：< <137; 
 std :: string result = stream.str（）; 
  
在C ++ 11中，您可以使用 std :: to_string 函数， c>< string> ：
  std :: string result = fun：+ std :: to_string（137）; 
  
希望这有助于！
 
I am trying to concatenate strings and integers as follows:
#include "Truck.h"
#include <string>
#include <iostream>

using namespace std;

Truck::Truck (string n, string m, int y)
{
    name = n;
    model = m;
    year = y;
    miles = 0;
}

string Truck :: toString()
{

    string truckString =  "Manufacturer's Name: " + name + ", Model Name: " + model + ", Model Year: " + year ", Miles: " + miles;
    return truckString;
}
I am getting this error:
error: invalid operands to binary expression ('basic_string<char, std::char_traits<char>, std::allocator<char> >'
      and 'int')
        string truckString =  "Manufacturer's Name: " + name + ", Model Name: " + model + ", Model Year: " + year ", Miles...
Any ideas what I might be doing wrong? I am new to C++.
解决方案
In C++03, as other people have mentioned, you can use the ostringstream type, defined in <sstream>:
std::ostringstream stream;
stream << "Mixed data, like this int: " << 137;
std::string result = stream.str();
In C++11, you can use the std::to_string function, which is conveniently declared in <string>:
std::string result = "Adding things is this much fun: " + std::to_string(137);
Hope this helps!

                        
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