Thread: Global variables, how can I add washerB to this program?

Code:

#include <stdio.h>
#include <math.h>

double	quantity1, thickness1, density1, inner1, outer1;
double product, area;
double washerA;

/*          Prototypes               */

void ReadData (void);
double FindProd (void);
double CircleArea (void);
void PrintResult (void);

int main(void)
{
	/*            Body of Control          */
	ReadData ();
	product=FindProd();
	area=CircleArea();
	washerA=product*area;
	PrintResult();
	return  0;
}

void ReadData (void)
{
	scanf ("%lf %lf %lf %lf %lf", &quantity1, &thickness1, &density1, &inner1, &outer1);
}
double FindProd (void) 
{
	double product;   /* local variable  */
	product = quantity1*thickness1*density1;
	return (product);
}
double CircleArea (void) 
{
	double area;   /* local variable  */
	area = ((3.142*(pow(outer1/2,2)))-(3.142*(pow(inner1/2,2))));
	return (area);
}
void PrintResult(void) 
{
	printf ("%0.2lf, %0.2lf\n",product,washerA);
}

Hello, I want this program to process 2 washers, in this case washerA and washerB, I must not pass any parameters in function calls.

why can't you pass parameters?

I cannot pass any parameters in function calls.

It was a required instruction for this program, I am a little stuck, I got it running for one Washer, but adding another one, I have been working on this for awhile!

I wonder what is the idea of that sort of rule, but anyway, why not just copy past the code and change the variable names?
Kinda stupid, but works

thought of another way, you could make a loop on main, but you would loose the first value(since you would be changing the same variable)

Originally Posted by laserlight

Time to find a new teacher. I'm sorry, but your teacher is teaching you bad habits.

I'll say....

While I don't shy away from using globals when absolutely necessary (things like status flags or settings) they are generally not that great an idea as routine. As laserlight says, this guy is teaching you some very bad habits here...

Code:

int main(void)
{
     for(int x = 0; x < 5; x++)
        {
	ReadData ();
	product=FindProd();
	area=CircleArea();
	washerA=product*area;
	PrintResult();
       }
     return  0;
}

There you go, now it will do 5 washers...