C ++中的结构问题

Question

I have the following code

#include <iostream>
#include<string>
#include <sstream>
using namespace std;
struct product{
    int weight;
    float price;
};
int main(){
    string  mystr;
    product  prod;
    product *pointer;
    pointer=&prod;
    getline(cin,pointer->price);
    return 0;
}

but it shows me the mistake

no instance of overloaded function "getline" matches argument list

What is the mistake?

Answer 1

The mistake is that you are trying to read a line of text into a float . Reading in an entire line requires that you read into a string. If you just want to read in a float from input, simply write:

cin >> pointer->price;

Which will read input up to the next whitespace and attempt to interpret it as a float .

Answer 2

The second argument to getline is supposed to be a reference to a string, not a float as you've used.

Or the other overload of getline you can use takes in a char* and a streamsize . Either way, the arguments you've specified do not match any overload of getline , and that is why you received the error you described.

Answer 3

The mistake is that getline returns string, not float.

string str;
getline(cin, str);
pointer->price = atof(str.c_str());