直接上例子,代码如下:
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main(){
string str = "128.00";
double digit;
stringstream str2digit;
str2digit << str;
str2digit >> digit;
double add_num = 22.50;
cout<< (digit + add_num) <<endl;
return 0;
}