C প্রোগ্রামিংয়ের বিভিন্ন Keywords

C Keywords

The C language reserves certain words that have special meanings to the language. Those reserved words are sometimes called C keywords. You should not use the C keywords as variable, constant, or function names in your program. The following are the 32 reserved C keywords:

Keyword	Description
auto	Storage class specifier
break	Statement
case	Statement
char	Type specifier
const	Storage class modifier
continue	Statement
default	Label
do	Statement
double	Type specifier
else	Statement
enum	Type specifier
extern	Storage class specifier
float	Type specifier
for	Statement
goto	Statement
if	Statement
int	Type specifier
long	Type specifier
register	Storage class specifier
return	Statement
short	Type specifier
signed	Type specifier
sizeof	Operator
static	Storage class specifier
struct	Type specifier
switch	Statement
typedef	Statement
union	Type specifier
unsigned	Type specifier
void	Type specifier
volatile	Storage class modifier
while	Statement

Don't worry if you can't remember all the C keywords the first time through. In the rest of the book, you'll become more familiar with them and start to use many of the keywords through examples and exercises.

Note that all C keywords are written in lowercase letters. As I've mentioned, C is a case-sensitive language. Therefore, int, as shown in the list here, is considered as a C keyword, but INT is not.

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The if-else Statement

The if statement

The if statement

If life were a straight line, it would be very boring. The same thing is true for programming. It would be too dull if the statements in your program could only be executed in the order in which they appear.

Mathematical Functions in C

Mathematical Functions in C

Basically, the math functions provided by the C language can be classified into three groups:

Trigonometric and hyperbolic functions, such as acos(), cos(), and cosh().

Changing Data Sizes

Changing Data Sizes

Enabling or Disabling the Sign Bit

Enabling or Disabling the Sign Bit

As you know, it's very easy to express a negative number in decimal. All you need to do is put a minus sign in front of the absolute value of the number. But how does the computer represent a negative number in the binary format?