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Program won't run.

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*/
/* 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,double *);
void areas(double,double *);
cout<<"Entre la circumferencia del circulo, para computar su area\n";
cin>>circum;
radio=radius(circum,&radio);
area=areas(radio,&area);
cout<<"El area de el circulo es "<<area;
}
void radius(double cicum,double *radio)
{
*radio=circum/(2.000000*PI);
}
void areas(double radio,double*area)
{
double area;
*area=PI*pow(radio,2.000000);
}

nietod

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jorhez

ASKER

Edited text of question

jorhez

ASKER

I had sent a similar message, but I forgot to include some changes I had done on the program. I want to use pointers on this one in order to understand them, although I know their not essntial.

jorhez

ASKER

I had sent a similar message, but I forgot to include some changes I had done on the program. I want to use pointers on this one in order to understand them, although I know their not essential.

jorhez

ASKER

I had sent a similar message, but I forgot to include some changes I had done on the program. I want to use pointers on this one in order to understand them, although I know their not essential for the program to run correctly.

pagladasu

First of all your functions are declared as returning void - it will be an error truing to capture the return value. All you need is to change these two lines:
radio=radius(circum,&radio);
area=areas(radio,&area);
Change them to:
radius(circum,&radio);
area=areas(radio,&area);

Thanks
pagladasu

Answers2000

Pagladasu - See
https://www.experts-exchange.com/topics/comp/lang/cplusplus/Q.10108117

He's already accepted my answer

ASKER CERTIFIED SOLUTION

billyh

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The_Brain

your pointers need the matching &address.

eg.

void radius(double, double *)

void main()
{
double circ;
double radio;

Radius(double, &double) ...there I think that's it.

but you could do this
radius(double, double)

and the proto will be void radius(double, double &);

}

pagladasu

Sorry Answer2000. Did not notice that that you had already answered it and that the answer had been accepted.