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Operators in C Language

Operators in C Language
Arithmetic Operators:
There are five basic arithmetic operators in ‘C’. They are:

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Relational Operators:
Relational operators check relationship between two operands. If the relation is true, it returns value 1 and if the relation is false, it returns value 0.
For example: a>b
Here,, > is a relational operator. If a is greater than b, returns 1, if not then it returns 0.
Relational operators are used in decision making in conditional statements and loops.

Operator
Meaning of operator
Example
==
Equal to
5==3 returns false (0)
> 
Greater than
5>3 returns true (1)
< 
Less than
5<3 returns false (0)
!=
Not equal to
5!=3 returns true (1)
>=
Greater than or equal to
5>=3 returns true (1)
<=
Less than or equal to
5<=3 returns false (0)

Logical Operators:
Operator
Meaning of operator
example
&&
Logical AND
If c=5 and d=2 then ((c==5) && (d>5)) returns false.
||
Logical OR
If c=5 and d=2 then ((c==5) || (d>5)) returns true.
!
Logical NOT
If c=5 then !(c=5) returns false.

Increment and Decrement operators:
In C, ++ and – are called increment and decrement operators respectively. Both of these operators are unary operators, i.e., used on a single operand. ‘++’ adds ‘1’ to operand and ‘- -‘from the operand respectively.
For example
Let a=5
a++; //a becomes 6
a--;  //a becomes 4
++a; //a becomes 6
--a; //a becomes 4
Difference between ++ and - - operator as postfix and prefix
When ++ is used as prefix (like: ++var), ++var will increment the value of var and then returns it.
But, if ++ used as postfix (like: var++), operator will return the value of the operand first and then only increment it.
For example:
#include <stdio.h>
Int main()
{
                int c=2,d=2;
                printf(“%d\n”, c++); // this statement displays 2 then only c incremented by 1 to 3.
                printf(“%d”, ++d); // this statement displays 1 to 3 then, only c is displayed.
                Return 0;
}

Conditional Operator:
Conditional operator (Ternary operator) takes three operands and consists of two sysmbols ? and :
Conditional operators are used for decision making in ‘C’.
For example:
d=(c>0)?10: -10;
If c is greater than 0, value of c will be 10 but, if c is less than 0, value of c will be -10.

Assignment operators:
The most common assignment operator is ‘=’. This operator assigns the value from the right side to the left side.
For example:
Age=5; // 5 is assigned to age
Old age=age; //value of age is assigned to old age
5=age; //Error! 5 is a constant. Constant cannot be changed
Two operators can be used in conjunctions as like”+ =”

Operator
Example
Same as
=
a=b
a=b
+=
a+=b
a=a+b
-=
a-=b
a=a-b
*=
a*=b
a=a*b
/=
a/=b
a=a/b
%=
a%=b
a=a%b

Bitwise Operators:
A bitwise operator works on each bit of data. Bitwise operators are used in bit level programming.
Operator
Meaning of operators
&
Bitwise AND
|
Bitwise OR
^
Bitwise exclusive OR
~
Bitwise complement
<< 
Shift left
>> 
Shift right
Example:
C program for bitwise operator is:
#include<stdio.h>
main()
{
                int x=7,y=9,and,or,xor,right_shift,left_shift;

                and=x&y;
                or=x|y;
                xor=x^y;
                left_shift=x<<1;
                right_shift=y>>1;
               
                printf(%d AND %d=%d\n",x,y,and);
                printf(%d OR %d=%d\n",x,y,or);
                printf(%d XOR %d=%d\n",x,y,xor);
                printf(Left shifting %d by 1 bit=%d\n",x,left_shift);
                printf(Right shifting %d by 1 bit=%d\n",y,right_shift);

                return 0;
}

OUTPUT:

7 AND 9 =1
7 OR 9 =15
7 XOR 9 =14
Left shifting 7 by 1 bit =14
Right shifting 9 by 1 bit = 4

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