Question

This is my first attempt at C++, following an example to calculate a tip through a console application. The full (working code) is shown below:

// Week1.cpp : Defines the entry point for the console application.

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

int _tmain(int argc, _TCHAR* argv[])
{
    // Declare variables
    double totalBill = 0.0;
    double liquour = 0.0;
    double tipPercentage = 0.0;
    double totalNoLiquour = 0.0;
    double tip = 0.0;
    string hadLiquour;

    // Capture inputs
    cout << "Did you drink any booze? (Yes or No)\t";
    getline(cin, hadLiquour, '\n');

    if(hadLiquour == "Yes") {
        cout << "Please enter you booze bill\t";
        cin >> liquour;
    }

    cout << "Please enter your total bill\t";
    cin >> totalBill;

    cout << "Enter the tip percentage (in decimal form)\t";
    cin >> tipPercentage;

    // Process inputs
    totalNoLiquour = totalBill - liquour;
    tip = totalNoLiquour * tipPercentage;

    // Output
    cout << "Tip: " << (char)156 << tip << endl;
    system("pause");

    return 0;
}

This works fine. However, I want to move:

cout << "Please enter your total bill\t";
cin >> totalBill;

to be the first line under:

 // Capture inputs

But when I do the application breaks (it compiles, but just ignores the if statement and then prints both cout’s at once.

Im scratching my head becuase I cant understand what’s going on – but I’m assuming I’m being an idiot!

Thanks

Answer 1

Try this

    // Capture inputs
cout << "Please enter your total bill\t";
cin >> totalBill;
cin.clear();
cin.sync();

See c++ getline() isn't waiting for input from console when called multiple times

Or, better yet don’t use getline at all:

cout << "Please enter your total bill\t";
cin >> totalBill;

cout << "Did you drink any booze? (Yes or No)\t";
cin >> hadLiquour;