string형 => 숫자형

#include <string>
string sNum = "1234";
string sNum_d = "1234.56";
int inum = stoi(sNum);
long lnum = stol(sNum);
double dnum = stod(sNum_d);
float fnum = stof(sNum_d);

숫자형 => string형

#include <string>
int inum = 1234;
long lnum = 1234;
double dnum = 1234.56;
float fnum = 1234.56f;
string intToString = to_string(inum);
string lognToString = to_string(lnum);
string doubleToString = to_string(dnum);
string floatToString = to_string(fnum);