NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part1/7272

Text File | 1996-08-05 | 1.9 KB | 89 lines

Path: erinews.ericsson.se!usenet
From: Otmar Conradus <[e-mail]>
Newsgroups: comp.lang.c++
Subject: Re: A simple "find the bug" (please! I need help :)
Date: Thu, 22 Feb 1996 10:48:55 -0800
Organization: Ericsson
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Jon wrote:
>
> I wrote this just now and it's telling me that when i try to cout the
> result at the bottom, it is an undefined value even though I did return
> the result var...  See if you can help.
>
> #include <iostream.h>
>
> float num1;
> float num2;
>
> getnums () {
>
> float result = num1 +num2;
>
> cout << "What number?\n";
> cin >> num1;
> cout << "And?\n";
> cin >> num2;
>
> return result;
> }
>
> main (){
>
> getnums ();
>
> cout << result;
> }
>
>         ^^^^^^ right there is the result i want printed but it does not
> recognize it even though I did try to return the value in the function
> getnums... am I missing something?
>
> Jon


1. You are using 2 global variables num1 and num2 but you didn't declare
   a variable result.

2. If you want your function getnums to return a value you must declare it
   as:
   float getnums()
   and in your main procedure call it as:
   result = getnums();

3. So your whole program can look like this:
#include <iostream.h>


float getnums () {
 float num1;    // abstain from using global variables if you
 float num2;    // don't need them globally
 float result;  // result is only known in this procedure

 cout << "What number?\n";   // read num1 and num2
 cin >> num1;
 cout << "And?\n";
 cin >> num2;

 result = num1 + num2;        // calculate result

 return result;
 }

 main (){
 float result;  // result in only known in main
 result = getnums();
 cout << result;
 }


Otmar Conradus
[e-mail]