C++ Functions Tutorial

C++ Functions Tutorial Continued:

C++ Functions

The functions that have a return value should use the return statement for termination. The main() function in C++ is, therefore , defines as follows:

int main()
{
	………..
	………..
	return 0;
}

Since the return type of functions is int by default he keywords int in the main() header is optional. Most C++ compilers will generate an error or warning if there is no return statement. Turbo C++ issues the warning

Function should return a value

And then proceeds to compile the program. It is good programming practice to actually return a value from main().

FUNCTION PROTOTYPING

Function prototyping is one of the major improvements added to C++ functions. The prototype describes the function interface to the compiler by giving details such as the number and type of arguments and the type of returns values.

Function prototype is a declaration statement is the calling program and is of the following form:

type function-name (argument - list)

Examples:

float volume (int x, float y, float z);