Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Program won't run.

Posted on 1998-12-13
5
184 Views
Last Modified: 2010-04-02
The program is not difficult, but when I use pointers it won't run.The program is as follows:
/* This program asks for the circumference and calculates the circle's radius and its area*/
#include<iostream.h>
#include<math.h>
#define PI 3.14159
void main(void)
{
double circum,area,radio;
void radius(double);
void areas(double);
cout<<"Entre la circumferencia del circulo, para computar su area\n";
cin>>circum;
radio=radius(circum);
area=areas(radio);
cout<<"El area de el circulo de circumferencia "<<circum<<"es "<<area;
}
void radius(double circum)
{
 double radio;
 radio=circum/(2.000000*PI);
 }
 void areas(radio)
 {
 double area;
 area=PI*pow(radio,2.000000);
 }
0
Comment
Question by:jorhez
  • 3
  • 2
5 Comments
 
LVL 22

Expert Comment

by:nietod
ID: 1180082
I don't see any problems there  But you said you are having problems with pointers.  I don't see any pointers anywhere.

Can you explain the problem a little more?
0
 
LVL 8

Accepted Solution

by:
Answers2000 earned 50 total points
ID: 1180083
It's not a pointer problem, it's that your not return values from your 2 functions correctly

C++ Language Question
     Title: "Program won't run."

     From: jorhez
                                                                                                                  Date: Sunday, December 13 1998 - 05:15PM PST
     Status: Waiting for answer
     Points: 50 Points (Easy)


     The program is not difficult, but when I use pointers it won't run.The program is as follows:
     /* This program asks for the circumference and calculates the circle's radius and its area*/
     #include<iostream.h>
     #include<math.h>
     #define PI 3.14159
     void main(void)
     {
     double circum,area,radio;
     double radius(double);
     double areas(double);
     cout<<"Entre la circumferencia del circulo, para computar su area\n";
     cin>>circum;
     radio=radius(circum);
     area=areas(radio);
     cout<<"El area de el circulo de circumferencia "<<circum<<"es "<<area;
     }
     double radius(double circum)
     {
      double radio;
      radio=circum/(2.000000*PI);
      return radio ;
      }
      double areas(radio)
      {
      double area;
      area=PI*pow(radio,2.000000);
      return area ;
      }
0
 
LVL 8

Expert Comment

by:Answers2000
ID: 1180084
Ooops...I meant to say

"It's not a pointer problem, it's that you're not returning values from your 2 functions correctly "

The corrections I made should be correct in the answer I made previously

BTW if you want to use pointers instead of return values from functions, here's an example I version of your program that does that

     #include<iostream.h>
          #include<math.h>
          #define PI 3.14159
          void main(void)
          {
          double circum,area,radio;
          void radius(double, double *);
          void areas(double, double *);
          cout<<"Entre la circumferencia del circulo, para computar su area\n";
          cin>>circum;
          radius(circum,&radio);
          areas(radio,&area);
          cout<<"El area de el circulo de circumferencia "<<circum<<"es "<<area;
          }
          void radius(double circum, double * pradio)
          {
           double radio;
           radio=circum/(2.000000*PI);
           *pradio = radio ;;
           }
           void areas(radio, double * parea)
           {
           double area;
           area=PI*pow(radio,2.000000);
           *parea = area ;
           }
0
 
LVL 8

Expert Comment

by:Answers2000
ID: 1180085
Oops another error

1. in my 6:23PM program, change

void areas(radio)
to
void areas( double radio )

2. In my 6:47PM program, change

void areas(radio, double * parea)
to
void areas(double radio, double * parea)



0
 
LVL 22

Expert Comment

by:nietod
ID: 1180086
I can't believe I missed that.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question