Under the
Primary Constant in C language, the constants, called number, comes out first,
which must be made with a specific end goal to utilize them in the program, the
accompanying principles have been recommended for any error in that structure.

● An Integer Constant must contain at
least one digit.

● There ought not be any decimal in the
integer constant.

● This constant has either positive
values inside it or holds negative values.

● On the off chance that you don't
choose the way of this consistent, then the default setting will be viewed as
Positive.

● Under integer constant, coma or empty
space cannot be utilized. 6 scope of integer constants range from - 32768 to
32767.

The scope of
the number steady relies on upon the span of the words utilized as a part of
the computer. This scope of 16 bit computers is the same, however 32 bit
computers can be more in the accompanying illustration. A few examples are
appearing beneath.

Example:

540

-855

-961

+100

**Rules for Creating Real Constants**

In this
language, Real Constant is additionally called Floating Point.These are
composed in two structures, one is known as a fractional form and the second is
called exponential form. To make a real constant in the fractional form, you
need to take over following rules.

● Under the Real Constant, there we
must have to put at least one digit.

● It is additionally compulsory to have
a decimal in a real consistent.

● Real Constant will either be positive
or negative.

● On the off chance that you don't
utilize any sign with positive negative, then it will be considered as positive
by default setting.

● Not permitted to utilize coma and
empty space in real consistent.

Example:

+515.12

+221.78

-55.32

-45.1245

The constant in
the exponential form is made in that condition when the constant's esteem is
either too little or too enormous. In this form, the real constant divided into
two sections the part comes before -e called mantissa and the other one called
exponent.

Rules

To make Real
Constant in Exponential Forms, you need to take after these standards -

● The primary piece of this sort of
mantissa portion of real constant ought to be isolated from the exponential
part by the letter of the English dialect “e”.

● The melissa part is either positive
or negative.

● In the event that you don't set a
positive or negative with the oblige, its esteem will be positive by default setting.

● Under the exponent, It must be
contain of one digit. This digit can likewise be positive or negative, it will
be positive as the default setting.

● The scope of this real constant can
go from -3.4e38 to 3.4e38.

Example:

+4.5e-2

1.2e8

-3.1e+7

-7.8e-2

**Rule for Creating Character Constant**

● To make a character constant, you
should utilise a letter, a digit or an uncommon symbol under an inverted comma.
Both inverted commas ought to indicate the left.

● Character Constant's base size ought
to be one letter.

Example:

‘B’

‘D’

‘8’

‘=’