Rules for naming convention of a variable :

1. First letter of a variable name cannot be a digit.

Example:

5id ✖

id5 ✔

i5d ✔

2. Special characters are not allowed within the variable name except an underscore _

Example:

rollno. ✖ //full stop is not allowed

roll no ✖ //space is not allowed

_rollno ✔

3. Keywords are not allowed within the variable name

Example:

void ✖

Comments

Data Representation

Digital Number System In digital representation, various number systems are used. The most common ones are : Binary : base 2 (0, 1) Octal : base 8 (0, 1, 2, 3, 4, 5, 6, 7) Decimal : base 10 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) Hexadecimal : base 16 (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F) Number Conversions : From Decimal to any system (base) (Decimal) 10 = (Any) base

Data Type Modifiers

As the name suggests, data type modifiers are used with fundamental data types to modify the length of data that a particular data type can hold. Following 4 datatype modifiers are available in C++: Signed Unsigned Short Long

Selection statement

If statement If tests a particular condition, if the condition evaluates to true then set of statements under the body of 'if' statement will be executed otherwise it will be ignored by the compiler. Syntax : if(<condition>) { statements; } <> : programmer defined If else statement If we use 'else' statement with 'if' statement then if the condition of 'if' statement evaluates to false, in that case body of else statement will be executed, otherwise it will be ignored. Syntax : if(<condition>) { statements; } else { statements; } If-else-if ladder If we use 'else if' statement with 'if' statement then if any condition evaluates to true, in that case its associated statement will be executed and all other 'else if' and 'else' statement will be ignored by the compiler. Syntax : if(<condition>) { statements; } else if(<condition>) { statements; } els...

Let's revise C++

Search This Blog