c++ to_String()

函数原型：
string to_string (int val);
string to_string (long val);
string to_string (long long val);
string to_string (unsigned val);
string to_string (unsigned long val);
string to_string (unsigned long long val);
string to_string (float val);
string to_string (double val);

string to_string (long double val);

功能：

将数值转化为字符串。返回对应的字符串。

示例：

#include    
#include      
using namespace std;

int main ()
{
  string pi = "pi is " + std::to_string(3.1415926);
  string perfect = std::to_string(1+2+4+7+14) + " is a perfect number";
  cout << pi << '\n';
  cout << perfect << '\n';
  return 0;
}

结果：

pi is 3.141593
28 is a perfect number