Doubles meant to divide add?

Question

I am making a c++ program which functions as a calculator. Everything works except for the division function, which adds the doubles for some reason. Anyone have a fix?

I have tried explicitly casting to a double and banging my head on my desk. Here are a few snippets of my code.

#include "pch.h"
#include <iostream>
using namespace std;

void divide()
{
    //first number
    cout << "What is the numerator?";
    double firstNum = 0;
    cin >> firstNum;
    //second number
    cout << "What is the denominator?";
    double secNum = 0;
    cin >> secNum;
    //multiplying
    double answer = firstNum/(double)secNum;
    cout << "Your answer is " << answer << ".";
}

int main() 
{
    //asks for what operation user would like to use
    cout << "Do you want to add, subtract, divide, or multiply? Type [1] for add, [2] for subtract, [3] for divide, and [4] for multiply(minus the brackets).";
    double opquery = 0;
    cin >> opquery;

    // if division
    if (opquery == 3)
    {
        divide();
        return 0;
    }
}

I would have expected something like 4/4 to equal 1, but it just returns addition

UPDATE: FULL CODE CAN BE FOUND AT https://github.com/hoverdoge/cppcalculatorerror/blob/master/code

Answer 1

Actually, the code you share here is ok and the result of 4/4=1.

But the code you share in the github has something different. Remove the ;after if (opquery == 1); The program can work normally.

Changes from:

if (opquery == 1);
    {
        add();
        return 0;
    }

To:

if (opquery == 1)
    {
        add();
        return 0;
    }

Note: When you add the extra ;after if(xxx), whatever the value of opquery is, the main method will execute steps below:

cout << "xxx...";
int opquery = 0;
cin >> opquery;
add();
return 0;

That's why this issue occurs.