Page 66 - DCAP404 _Object Oriented Programming

Unit 3: Review of Functions

} Notes
long sum(long a, long b)
{
return (a + b);
}
float sum(double a, double b)
{

return (a + b);
}
Overloaded functions have the same name but different number and type of arguments. They
can differ either by number of arguments or type of arguments or both. However, two overloaded
function cannot differ only by the return type.

Task In overloaded functions, the function call determines which function definition
will be executed. Explain with an example.

Self Assessment

Fill in the blanks:
6. Function overloading is a feature of C++ that allows us to create ………………. functions
with the same name, so long as they have different parameters.
7. Overloaded functions have the same name but different number and…………………. .
8. If a function call fails to compile by the number and type of argument(s), the compiler
reports the same as………………. .
9. Function overloading can lower a programs …………………….. significantly while
introducing very little additional risk.
10. Member function declarations with the same name and the name parameter-type-list
cannot be ……………………. if any of them is a static member function declaration.

3.3 Inline Functions

C++ provides facility of inline function, which is designed to speed up the program execution.
This is done by the C++ compiler, which incorporates it into a program.
When any program is compiled the output of compilation is a set of machine language
instructions, which is in executable program. When a program is run, this complied copy of
program is put into memory. Each instruction gets a memory address, which is used to refer that
instruction. These instructions are executed as per the logic in the program. Instructions are
executed step by step unless there are any loop or branching instructions. When there is branch
or jump instruction, some instructions are skipped and forward or backward jump is made.
In normal function call, the control of execution is transferred to the location where the function
is loaded in memory that is the starting executable instruction of the function. When all the
instructions of the function are executed the control returns back to main program from where left.

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