【Cpp 语言基础】简单聊一聊to

头文件：#include<string>

功能：将数字常量转换为字符串

参数：value

返回值：转换好的字符串

重载版本：

std::string to_string(int value); (1) (C++11起)
std::string to_string(long value); (2) (C++11起)
std::string to_string(long long value); (3) (C++11起)
std::string to_string(unsigned value); (4) (C++11起)
std::string to_string(unsigned long value); (5) (C++11起)
std::string to_string(unsigned long long value); (6) (C++11起)
std::string to_string(float value); (7) (C++11起)
std::string to_string(double value); (8) (C++11起)
std::string to_string(long double value); (9) (C++11起)

举例：

#include <iostream>   // std::cout
#include <string>     // std::string, std::to_string
using namespace std ;
 
int main()
{
	std::string pi = "pi is " + std::to_string(3.1415926);
	std::string perfect = std::to_string(1 + 2 + 4 + 7 + 14) + " this is a perfect number";
	std::cout << pi << '\n';
	std::cout << perfect << '\n';
	
	system("pause");
 
 
}