[Solved] Class involving functions & if/else if statements [closed]

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Correcting compile time errors is not a hard task. Follow error messages and try to find out the problem. I will show you some examples in your code to solve errors. Your code has many error which shows you need practice more in C++.

The declaration of showMenu is void showMenu(int &) but you are calling it by showMenu():

void showMenu(int &);
              ^^^^^
                Remove it

Also, to call a function you shall not pass types:

area = double area (double length, double width);
       ^^^^^^              ^^^^^^         ^^^^^^

More, when implementing a function, you shall not put ; after function signature:

double area (double radius); <--- remove semicolon
{

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solved Class involving functions & if/else if statements [closed]