以下是Windows/Linux系統中常用的C/C++各種數據類型轉換匯總：
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <string.h>
int main()
{
// 1--> int to char[]
int tmp1 = 100;
char ch1[15];
sprintf(ch1, "%d", tmp1);
std::cout<<ch1<<std::endl;
// 2--> int to string
int tmp2 = 111;
char ch2[15];
sprintf(ch2, "%d", tmp2);
std::string str2;
str2 = std::string(ch2);
std::cout<<str2<<std::endl;
// 3--> int to enum
enum enum3 {
A,
B
};
int tmp3 = 222;
enum3 val3 = static_cast<enum3>(tmp3);
std::cout<<val3<<std::endl;
// 4--> char[] to string
char arr4[] = "this is a sample";
std::string str4;
str4 = std::string(arr4);
std::cout<<str4<<std::endl;
// 5--> char to int
char ch5 = '8';
int val5 = ch5 - '0';// val5 is bounded by 0 to 9
std::cout<<val5<<std::endl;
// 6--> char[] to int
char arr6[] = "12345";
int tmp6;
sscanf(arr6, "%d", &tmp6);
std::cout<<tmp6<<std::endl;
// 7--> char* to int
char* pch7 = "444";
int tmp7;
tmp7 = atoi(pch7);
std::cout<<tmp7<<std::endl;
// 8--> char* to float
char* pch8 = "55.5";
float tmp8;
tmp8 = (float)atof(pch8);
std::cout<<tmp8<<std::endl;
// 9--> char* to double
char* pch9 = "66.666";
double tmp9;
tmp9 = atof(pch9);
std::cout<<tmp9<<std::endl;
// 10--> float to char[]
float tmp10 = 11.11;
char ch10[20];
sprintf(ch10, "%f", tmp10);
std::cout<<ch10<<std::endl;
// 11-> int to char*
int tmp11 = 777;
char* pch11;
char ch11[20];
sprintf(ch11, "%d", tmp11);
pch11 = ch11;
std::cout<<pch11<<std::endl;
// 12--> double to char[]
double tmp12 = 8.888;
char arr12[20];
sprintf(arr12, "%f", tmp12);
std::cout<<arr12<<std::endl;
// 13--> char* to string
char* pch13 = "hello, world";
std::string str13;
str13 = std::string(pch13);
std::cout<<str13<<std::endl;
// 14--> 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<<arr14<<std::endl;
// 15--> string to const char*
std::string str15 = "ha ha";
const char* pch15;
pch15 = str15.c_str();
std::cout<<pch15<<std::endl;
// 16--> float to int
float ftmp16 = 99.99;
int tmp16;
tmp16 = static_cast<int>(ftmp16);// static_cast<int>(ftmp16 + 0.5)
std::cout<<tmp16<<std::endl;
return 0;
}
