Explanation of value of a variable in c programming language
by examples and questions and answers
Data which any variable keeps is known as value of variable. For example:
int a=5;
Here value of
variable a is five. Name of variable always returns value of the variable.
How to assign
any value to a variable:
C supports
eleven type of assignment operator to assign any value to operator. Those are:
(a) =
(b) +=
(c) -=
(d) v*=
(e) /=
(f) %=
(g) <<=
(h) >>=
(i) |=
(j) &=
(k) ^=
In this chapter
will discuss only first operator i.e. =
Assignment
statement in c:
LValue: Lvalue stands for left value. In
any assignment statement LValue must be a container i.e. which have ability to
hold the data. In c has only one type only container and which is variable.
Hence LValue must be any variable in c it cannot be a constant, function or any
other data type of c. For example
#define <stdio.h>
#define max 125
struct abc{
char *name;
int roll;
};
enum {RED,BLUE};
int main(){
int a;
const b;
a=5;
//10=5; LValue cannot be a integer
constant
//max=20; //Lvalue cannot be a micro
constant
//b=11; Lvalue cannot be a constant
variable
//float=3.3f; Lvalue cannot be a data
type
//abc={“sachin”,5}; Lvalue cannot be a
data type
//BLUE =2; Lvalue cannot be a enum
constant
return 0;
}
RValue: In any assignment
statement RValue must be anything which can return and constant value or it is
itself a constant. RValue can be any c constants, variables, function which is
returning a value etc. For example:
#include<stdio.h>
#define max 5
void display();
float sum();
enum {BLACK, WHITE};
int main(){
int x=2; //RValue can
be a constant.
float y=9.0;
const int z=x; //RValue can
be a constant variable
x=max; //RValue can
be a variable.
x=BLACK; //RValue can be a enum constant.
y=sum();//RValue can be a function.
y=display(); //RValue can
be a function which is
return 0;
}
