【C++】int、const char*、char*、char、string之间的转换

#include "stdafx.h"
#include<string>
#include<vector>
#include<iostream>
#include<sstream>
#include<stdio.h>
#include<stdlib.h>using namespace std;//sstream
string int2str1(int n){
ostringstream oss;
oss << n;
string s = oss.str();
return s;
}//sprintf
string int2str2(int n){
char temp[];
sprintf_s(temp, "%d", n);
string str = temp;
return str;
}//sstream
int str2int1(string s){
int n;
istringstream iss;
iss.clear();
iss.str(s);
iss >> n;
return n;
}//sscanf
int str2int2(string s){
int n;
sscanf_s(s.c_str(), "%d", &n); //scanf前面加s用于把str输入到n中
return n;
}//stoi
int str2int3(string s, int base){ // base:进制
int n = stoi(s, nullptr, base);
return n;
}//c_str
const char* str2Cchar(string s){
//const char* ss = s.c_str(); //出错，因为s会被析构，ss指向垃圾内容
char c[];
strcpy_s(c, s.c_str()); return c;
}//atoi
int Cchar2int(const char* s){
//char buffer[100];
int n = atoi(s);
return n;
}char* int2char(int n){
char buffer[];
_itoa_s(n, buffer, );
return buffer;
}int _tmain(int argc, _TCHAR* argv[])
{
//cout << str2int1("1234") << endl;
//cout << str2int2("1234") << endl;
//cout << int2str1(1234) << endl;
//cout << int2str1(1234) << endl; //string s1 = "123455";
//const char* ss1 = str2Cchar(s1); //char s2[] = "123455";
//const char* ss2 = s2;
//cout << Cchar2int(ss2) << endl; char* c = int2char();
cout << *c << endl; return ;
}