Super simple functions question

[rajputsadia]

I'm new to using functions and all I'm trying to do is get the user age using a function called getAge. The problem is that it keeps saying "error the identifier userAge is undefined"

#include<iostream>
#include<iomanip>

using namespace std;

int getAge();

int main()
{
  int userAge;
      userAge = getAge();

           cout << userAge << endl;
}

// Function definition
int getAge()
{
     do
        {
           cout << "Enter age:";
           cin >> userAge;
        } while (userAge <= 0);
     return userAge;
}

[firedraco]

You don't have a variable called userAge inside your function. Variables do not transfer across functions unless you specifically pass them.

[kingkong200]

It is because you are trying to pass a function with no arguments in it. Say if you did

 
#include<iostream>
#include<iomanip>

using namespace std;

int getAge(int userAge); //<--- note the argument pass 

int main()
{
  int userAge = 0;
      userAge = getAge(userage); //<--- pass the int argument

           cout << userAge << endl;
}

// Function definition
int getAge(int userage)
{
     do
        {
           cout << "Enter age:";
           cin >> userAge;
        } while (userAge <= 0);
     return userAge;
}

[rajputsadia]

That was it, thank you =)