CODEWITHSUNDEEP
c++variables
jaw2233
jaw2233

Reputation: 3

in c++ i cant select a specific variable for use with user input

I am trying to make a program where you can add an item to a list, and each item has a specific value, and at the end it tallies them all up, but I can't find a way to allow a user to type in the name of a variable and it identifies it for use! I have already attempted to use cin >> but that didn't work!

Upvotes: 0

Views: 289

Answers (2)

brettwhiteman
brettwhiteman

Reputation: 4452

You don't need to name the input values. The code below will return the sum of all numbers entered. Enter a blank line to end the list of numbers.

#include <iostream>
#include <sstream>


int main() {
    std::string line;
    int sum = 0;

    while(true) {
        std::getline(std::cin, line);

        if (line.empty())
            break;

        int val;
        std::istringstream(line) >> val;

        sum += val;
    }

    std::cout << sum;

    return 0;
}

If you do need to assign names to the input values for some reason, I suggest using a std::unordered_map.

Upvotes: 1

ChemiCalChems
ChemiCalChems

Reputation: 643

The syntax to use cin is cin >> var; not cin << var;. Also, I recommend not using namespace std; and do std::cin >> var;

Upvotes: 1

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