Writing with C++ functions

Question

I am trying to write code using multiple functions that simply gets average days employees missed for a company i tried to use global identifiers here is my code

#include<iostream>
using namespace std;
int days;
int numberemployees;
int main()
{
    int days;
    int numberemployees;
    double average;
    cout<<"How many employees do you have";
    cin>>numberemployees;
    daysmissed;
    averagedays;

    return 0;
}

int daysmissed(int)
{
    int days;
    cout<<"How many total days where missed by employees this year";
    cin>>days;
    return days;
}

double averagedays(double)
{
    double average;
    average=days/numberemployees;
    return average;
}

What's the question/problem? State the specific part of your code that is not working, and you'll get better/quicker assistances. — jmstoker, Sep 13 '13 at 00:03
What exactly is the problem? What results are you getting and what results were you expecting? — nietaki, Sep 13 '13 at 00:03
@nietaki Looks like the poster is trying to learn function-calling syntax — Dennis Meng, Sep 13 '13 at 00:06
You have more problems than just undeclared identifiers. Can I suggest a good C++ book? [The Definitive C++ Book Guide and List](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list) — Blastfurnace, Sep 13 '13 at 01:34

score 1 · Answer 1 · answered Sep 13 '13 at 00:22

To create a function (other than int main()), you need two parts, the declaration and the definition. The declaration is usually at the top of your code and looks like this:

int foo(int); //foo(int) declaration

The declaration is necessary for code to use the function before it is defined. The other part of a function is the definition, where you define the function:

int foo(int i)
{
     return i + 1;
}

Your mistake was you forget the declaration and the messed up the definition

Writing with C++ functions

1 Answers1