Comments Line
Comments are portions of the code ignored by
the compiler which allow the user to make simple notes in the relevant areas of
the source code. Comments come either in block form or as single lines.
·
Single-line comments :- start with // and continue
until the end of the line. If the last character in a comment line is a \ the comment will
continue in the next line.
·
Multi-line comments :- start with /* and end
with */
Function
A function in C++ is a group of statements that together perform
a specific task. Every C/C++ program has at least one function that the name is
main. The main function is called by the operating system by
which our code is executed. We can make n number of function in a single
program but we can make only one main function in a single
program. Every program has only one main function.
The
main part of functions is return_type, function_name, parameter and
functions body.
Syntax
:-
|
1 2 3 4 |
Return_type Function_name
(Parameters) { //
Function Body; } |
Steps for function
§ Function prototype
§ Function
definition
§ Function call
Function Prototype
The
function prototypes are used to tell the compiler about the number of
arguments and about the required datatypes of a function parameter, it also
tells about the return type of the function. By this information, the compiler
cross-checks the function signatures before calling it
Function prototype
i.
Function type
ii.
Function name
iii.
Function
parameter/arguments
iv.
Terminator
Syntax : Type function_name(parameter);
Ex. Int add(int,int);
Function
definition
i.
Function type
ii.
Function name
iii.
Function
parameter/arguments
iv.
Variables
v.
Statement
Syntax : Type function_name(parameter variables)
{
Statements;
}
Ex. Int add(intx,inty)
{
Statements;
}
Function
call
i.
Function name
ii.
Function
parameter/arguments
iii.
Terminator
function_name(parameters);
add(5,8);
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