C++数值转换

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#include <iostream>
#include <string>
#include <cmath>

int main() {
	// 数字转字符串
	int num = 123;
	std::string strNum = std::to_string(num);
	std::cout << "数字转字符串: " << strNum << std::endl;
	
	// 字符转数字
	std::string strInt = "456";
	int intNum = std::stoi(strInt);
	std::cout << "字符转数字: " << intNum << std::endl;
	
	// 字符转浮点数
	std::string strFloat = "789.01";
	float floatNum = std::stof(strFloat);
	std::cout << "字符转浮点数: " << floatNum << std::endl;
	
	// 浮点数转字符
	float floatNum2 = 123.45f;
	std::string strFloat2 = std::to_string(floatNum2);
	std::cout << "浮点数转字符: " << strFloat2 << std::endl;
	
	// 双精度转字符
	double doubleNum = 123.456;
	std::string strDouble = std::to_string(doubleNum);
	std::cout << "双精度转字符: " << strDouble << std::endl;
	
	// 字符转双精度
	std::string strDouble2 = "789.101";
	double doubleNum2 = std::stod(strDouble2);
	std::cout << "字符转双精度: " << doubleNum2 << std::endl;
	
	return 0;
}

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