string轉int
#include<string>
#include<sstream>
string str;
stringstream ss;
int num;
ss<<str;
ss>>num;
char *轉int
#include<cstdlib>
char *argv[];
num=atoi(argv[1]);
string轉int
#include<string>
#include<sstream>
string str;
stringstream ss;
int num;
ss<<str;
ss>>num;
char *轉int
#include<cstdlib>
char *argv[];
num=atoi(argv[1]);