C KEYWORDS – A BRIEF DESCRIPTION

C KEYWORDS - The 32 keywords in C Language

3. CASE KEYWORD

case keyword is one of the C keywords among switch and default which we use in Multi-directional conditional control statement.

Furthermore, there are times when there’s a need in program to make choices among a number of alternatives. Therefore, for providing those choices we use case keyword in the program. case keyword is a part of Syntax of switch statement due to which user makes choices.

SYNTAX :

Keyword_name constant:

Here, keyword name will be “case” and constant can be an integer or character. Above all, we should always place a constant after case Keyword.

We cannot use floating point or string constants. Every constant in switch statement must be different from one another. We can’t Multiple constants in a single case.

Each case follows only one constant..

EXAMPLE :

case 4:    ,    case ‘a’:    ,    case 1+1:    ,    case ‘a’>’b’:

These all are valid examples of using case keyword.

Some of the invalid examples are –

case “first”:    ,    case 2.1:    ,    case a:    ,    case a>b:

 

4. CHAR KEYWORD

char is one of the C keywords which we use for storing any single Character. Furthermore, with the help of char keyword we can declare a Character Variable.

char is a fundamental or pre-defined data type takes 1 byte from the memory. The char data type has 2 types of type qualifiers

  • Signed char
  • Unsigned char

Signed char datatype ranges from -127to 127 and unsigned char datatype ranges from 0 to 255.

SYNTAX :

keyword_name Variable_name;

Here, keyword name is char and variable name will be the name of the variable given by user.

EXAMPLE :

char a;

Here, char is Character datatype and “a” is the Variable name storing single Character.

Initialising char datatype :

char a=’A’;

Here, ‘A‘ is a Character value which is initialised by Variable a.

 

5. CONST KEYWORD :

A Constant is a value which we can’t change during the execution of the program.

We can use const keyword in the program to declare a variable, identifier, etc. as a constant identity.

If we declare a variable, Identifier or any other entity as Constant then it’s value remains constant throughout the program.

SYNTAX :

Keyword_name data_type Variable_name;

Here, keyword name is const. We can use any data type such as int, char, float, or double. Likewise, Variable name is also the user’s choice.

EXAMPLE :

const int c;

Here, const is the keyword name. int is the integer data type. And c is the Variable name.

Likewise, if we take const float pi=3.14; 

Then , in the whole program there will be no change in the value of pi. The value of pi will be only 3.14 in the whole program no matter what changes occur.

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