Variable with examples

Variable refers to a name of particular space, where values can be stored and change/manipulate in program. Every variable is assigned to specific datatype (int, float, char etc).

Variable declaration:

Syntax:

datatype_variable1, variable2, variable3, ..., ..., ..., ..., variableN;

Example (A):

int a, b, c;

Example (B):

float x, y, z;

Variable initialization:

Syntax:

Datatype variable_name1=value, variable_name2=value2;

Example (A):

int a=5, b=7;

Example (B):

float x=11.65, y=32.54;

Let's see examples to get better understand.

Example 1:

int a,b,c=0;

// after some line of code

a=18;

b=54;

c=a+b;

In above small line of code shows a,b and c are variable.

int is datatype assigned to specific variable.

initially a and b have no values, but we can see that c have 0.

after some line of code a and b got some values in integer (Numeric value). that values are stored in respective variable.

now next line c=a+b;

we already assigned 0 value to c, after this c=a+b; c have new value which is addition of variable a and variable b. New value is overwrite on variable c.

Example 2:

int c=0;
float a,b,d;

// after some line of code

a=18.13;
b=54.94;
c=a+b;
d=a+b;

In this example float datatype is assigned for variable a, b and d, and integer is assigned for c.

now output is:

c=73

d=73.070000

due to difference in datatype of variable c and d, output is different. (If you are not familiar with "datatypes", kindly read about it)