C/C++各種數據類型轉換匯總

C/C++各種數據類型轉換匯總

以下是Windows/Linux系統中常用的C/C++各種數據類型轉換匯總：

#include 
#include 
#include 
#include 
#include 

int main()
{
	// 1--> int to char[]
	int tmp1 = 100;
	char ch1[15];
	sprintf(ch1, %d, tmp1);
	std::cout< int to string
	int tmp2 = 111;
	char ch2[15];
	sprintf(ch2, %d, tmp2);
	std::string str2;
	str2 = std::string(ch2);
	std::cout< int to enum
	enum enum3 {
		A,
		B
	};
	int tmp3 = 222;
	enum3 val3 = static_cast(tmp3);
	std::cout< char[] to string
	char arr4[] = this is a sample;
	std::string str4;
	str4 = std::string(arr4);
	std::cout< char to int
	char ch5 = '8';
	int val5 = ch5 - '0';// val5 is bounded by 0 to 9
	std::cout< char[] to int
	char arr6[] = 12345;
	int tmp6;
	sscanf(arr6, %d, &tmp6);
	std::cout< char* to int
	char* pch7 = 444;
	int tmp7;
	tmp7 = atoi(pch7);
	std::cout< char* to float
	char* pch8 = 55.5;
	float tmp8;
	tmp8 = (float)atof(pch8);
	std::cout< char* to double
	char* pch9 = 66.666;
	double tmp9;
	tmp9 = atof(pch9);
	std::cout< float to char[]
	float tmp10 = 11.11;
	char ch10[20];
	sprintf(ch10, %f, tmp10);
	std::cout< int to char*
	int tmp11 = 777;
	char* pch11;
	char ch11[20];
	sprintf(ch11, %d, tmp11);
	pch11 = ch11;
	std::cout< double to char[]
	double tmp12 = 8.888;
	char arr12[20];
	sprintf(arr12, %f, tmp12);
	std::cout< char* to string
	char* pch13 = hello, world;
	std::string str13;
	str13 = std::string(pch13);
	std::cout< string to char[]
	std::string str14 = dog, cat;
	char arr14[255];
	strncpy(arr14, str14.c_str(), sizeof(arr14));
	arr14[sizeof(arr14) - 1] = 0;
	std::cout< string to const char*
	std::string str15 = ha ha;
	const char* pch15;
	pch15 = str15.c_str();
	std::cout< float to int
	float ftmp16 = 99.99;
	int tmp16;
	tmp16 = static_cast(ftmp16);// static_cast(ftmp16 + 0.5)
	std::cout<