Help in C++ functions

[Rajnish Kaushik]

I want to make an programme in c++ (Using Functions) to find the area of squre but i m not able to make it

so can someone help me giving some hints

my coading for function is

int area(int m)

int i,area;

area=i*i;

return(area)

}

but i m getting error that

1-i is assigned to value that is never used

2-m is assigned to a value that is never used

[Sensei]

If that's all what you really have, the most visible error is lack of bracket.

 

It should be

 

int area(int m) {

 

And error is obvious - you have uninitialized variable i

Shouldn't you multiply by m?

 

int calculate_area(int m)

{

return(m*m)

}

 

Better don't use the same name for variables and function name!

Difference between uninitialized variable:

 

int a;

 

and initialized:

 

 

int a = 0;

 

or

 

int a = b;

 

Initialization means assigning some value to it.

Uninitialized variable has random data so using it might result in crashing computer in the worst scenario.

[Rajnish Kaushik]

please check it out

[Sensei]

calculate_area() doesn't mean cal_area()...

They have to have the same name for both.

 

You should have functions declared ABOVE main() where they're used. Otherwise you have to make prototype. Prototype for your function would be line

int cal_area(int);

 

Get rid of this "int" where is cursor, it's causing error.

[Rajnish Kaushik]

now it this

[Strange]

You don't need the "int" when you call the function. Just: cout << "Area "<< cal_area(n);

[Rajnish Kaushik]

thnx its done yeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

[Sensei]

It won't affect functionality of your code, but better place prototype declaration outside of main() function (before it).

In large sources, prototypes are usually put to separate files with .h extension (h = header). Then you can include them in multiple source files.

Edited January 26, 2014 by Sensei

[Rajnish Kaushik]

A huge thnx to strange and sensai