如何在字符串中添加整数? [英] How to add integer in a string?

问题描述

我想用字符串值而不是变量附加整数值.

I want to append integer value with string value but not a variable.

我试图将一个整数值放入一个名为二月的字符串中.我用 += 操作符试过了，但没有用.

I tried to put an integer value which is variable with a string called February. I tried it using += operator but it did not work.

string getMonth(day)
{
      if(day >=31 ){
          day -= 31;
          "February "+=day;
      }
}

推荐答案

做类似的事情

#include <string>

// ...

std::string s( "February " );

s += std::to_string( day );

这是一个演示程序

#include <iostream>
#include <string>

int main()
{
    std::string s( "February " );

    int day = 20;

    s += std::to_string( day );

    std::cout << s << '\n';
}

它的输出是

February 20

另一种方法是使用字符串流.

Another approach is to use a string stream.

这是另一个演示程序.

#include <iostream>
#include <sstream>
#include <string>

int main()
{
    std::ostringstream oss;
    int day = 20;

    oss << "February " << day;

    std::string s = oss.str();

    std::cout << s << '\n';
}

其输出与上图相同.

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