stringstream与atoi实现字符串与int,double型转换之比较

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main() {
	string s="54.653";
	double d=atoi(s.c_str());
	cout << d << endl;//54
	stringstream ss;
	ss << s;
	ss >> d;
	cout << d; //54.653
    return 0;
}