This is a code to find the area tell me where im worng

Question

1.00/5 (1 vote)

See more:

 #include <iostream>
using namespace std;
 class  area{
 
     int arr1;
     int arr2;
     public:
      void rectangle(
          int lenght ,int breadth){
              cout<<"the value of length is"<<endl;
              cin>>lenght;
              cout<<"the value of breadth is "<<endl;
              cin>>breadth;
              arr1=lenght*breadth;
              cout<<"the area of rectangle is"<<arr1<<endl;
          }
        void circle(int r){
           int pi;
            pi=3.14;
            cout<<"the value of radius is"<<endl;
            cin>>r;
            arr2=pi*r*r;
            cout<<"the area of circle is"<<arr2<<endl;
        }
 };
int main(){
    rectangle();
    circle();
    
    return 0;
}

What I have tried:

<pre>
 
 class  area{
 
     int arr1;
     int arr2;
     public:
      void rectangle(
          int lenght ,int breadth){
              cout<<"the value of length is"<<endl;
              cin>>lenght;
              cout<<"the value of breadth is "<<endl;
              cin>>breadth;
              arr1=lenght*breadth;
              cout<<"the area of rectangle is"<<arr1<<endl;
          }
        void circle(int r){
           int pi;
            pi=3.14;
            cout<<"the value of radius is"<<endl;
            cin>>r;
            arr2=pi*r*r;
            cout<<"the area of circle is"<<arr2<<endl;
        }
 };
int main(){
    rectangle();
    circle();
    
    return 0;
}

Posted 28-Oct-21 6:21am

sid0000

Updated 28-Oct-21 6:42am

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Answer 1 · 2021-10-28T06:31:00

The most obvious errors:

You are not using the classes you have created. Once you have defined area class, you have to create an instance of area class and store it in a variable to access its methods easily.

C++

int main()
{
   area myArea;
   area.rectangle(/* missing parameters here */);
   area.circle(/* and here as well */);
}

As said in code comments, the second issue is that you are trying to call rectangle() and circle() functions without providing them with their parameters. The function call must match function signature, otherwise compiler will issue an error.

Maybe a quick refresh on c++ 101, and its usage of classes, could suit you?
C++ Classes and Objects[^]

You will also meet an issue with arr2, since you will store in an integer the result of a double operation; your results for the circle will be truncated values (values without their decimal parts). You should double type for arr2; and probably for arr1 as well, as a matter of consistency.

Last, you should try to give meaningful name to your variables:

C++

// Compare
arr2 = pi*r*r;
// to
circleArea = pi*r*r;

This makes things a lot easier for you and for anyone who wants to read the code.

Richard MacCutchan · Answer 2 · 2021-10-28T06:42:00

I did notice that your rectangle and circle functions' definitions indicate that they require input parameter values, but you ignore them and take inputs from the console. So your declarations should be changed to:

C++

void rectangle(){

// and for circle 

void circle(){

Also you have put these methods into a class called area but you are trying to call its members directly, which is not possible.

Change the code in main to the following:

C++

area myarea; // instantiate an area object
myarea.rectangle(); // call the object's methods
myarea.circle();

This is a code to find the area tell me where im worng

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0