I want to compute array of r=[1, 2, 3, 4, 5] and then get area of circle, a[5]. What is the bug in my code? Thanks.

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I want to compute array of r=[1, 2, 3, 4, 5] and then get area of circle, a[5]. What is the bug in my code? Thanks.

What I have tried:

C

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

int main()
{
	int i,r[i];
	double r,pi,a[5],ar;
	
	double area(r);
	a[5]=area(r);
	
	printf("%.3e",a[5]);

	for (i=0;i<5;i++)
	{
		pi=3.142;		
		r[i]=i+1;
		area=pi*pow(r,2);
		
		return ar
	}

	
	
	return 0;
}

Posted 5-Dec-16 1:25am

Member 12887589

Updated 6-Dec-16 22:52pm

#realJSOP

v4

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Comments

StM0n 5-Dec-16 7:42am

Not quite sure what you expect as output as ar isn't set...

ZurdoDev 5-Dec-16 7:47am

If you want to know what is wrong, debug it and find out. Simple.

#realJSOP 5-Dec-16 8:32am

This is NOT a C# question. Pay attention to your tags so you get the appropriate people looking at your question.

3 solutions

Solution 2

Use the debugger to see what your code is doing. It allow you to execute lines 1 by 1 and to inspect variables after each lines.

You should learn to use the debugger as soon as possible. Rather than guessing what your code is doing, It is time to see your code executing and ensuring that it does what you expect.

The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

Posted 5-Dec-16 2:29am

Patrice T

Solution 3

You missed a colon in first return statement.

Posted 6-Dec-16 22:52pm

Vishnuprasanth

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CPallini · Accepted Answer · 2016-12-05T01:47:00

There are several bugs in your code. For instance you did't initialize your variables.
Another problem is your area fucntion definition. Try

C

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


double circle_area(double ray);

int main()
{ 
  double a[5] = { 1.0, 2.0, 3.0, 4.0, 5.0 };
  int i; 
  for (i=0; i<5; ++i)
  {
    printf("ray = %g, area = %g\n", a[i], circle_area(a[i]));
  }
  
  return 0;
}   
    
    
double circle_area(double ray)
{
  return (ray * ray * M_PI); // M_PI is defined in math.h
}