#include<iostream>
#include<string>
using namespace std;
string ToString(int i)
{
string str = std::to_string(i);
return str;
}
int main()
{
int i = 1024;
string str1 = ToString(i); //str1 = "1024"
string str2 = ToString(i).c_str();//str2 = "1024"
const char * str3 = str1.c_str(); //str3 = "1024"
const char * str4 = ToString(i).c_str();//str4 = ""; strlen = 0;
return 0;
}
如果函数返回值为std::string类型,那么不要使用const char * 来接。