C++ tutorial-C++ operators


Operators in C++


Once you have variables declared, you will do operations. An expression is the sequence of operands and operators to reduce in to one value. C++ provides you a lot of operators as shown below.

-Assignment operator (=)

Assignment operator is used to assign a value to a variable.
Example:
int x;
int y;
x=10; //assign 10 to x variable
y=x; //assign x to y variable

-Arithmetic operators (+, -,*, /, %)

Arithmetic operators are used to perform arithmetic operations on variables.
 

Sign

Meaning

+

Addition

-

Subtraction

*

Multiplication

/

Division

%

Division of modulus

 
Example:
int x;
int y;
int z;
int a;
int m;
x=10;
z=y+x;
a=z-(y=5);
m=a%y;
 

-Compound assignation operators (+=, -=, *=, /=, %=, <<=, >>=, &=, |=, ^=)

Compound assignation operators are used to perform operations (+, -, *, /,…) on variables with assignment operation.
 

Operator

Example

Equal to

+=

i+=1

i=i+1

-=

i-=1

i=i-1

*=

i*=2

i=i*2

/=

i/=2

i=i/2

%=

i%=2

i=i%2

<<=

i<<=2

i=i<<2

>>=

i>>=2

i=i>>2

&=

x&=3

x=x&3

|=

x|=y

x=x|y

^=

x^=y

x=x^y

 

-Comparison Operators (==, >, <, >=, <=,!=)

Comparison operators are used to compare variables. They return a Boolean value (true or false).



Operator

Meaning

Example

==

Equal to

(x==y)


Greater than

(x>y)


Less than

(x<y)

>=

Greater than or equal

(x>=y)

<=

Less than or equal

(x<=y)

!=

Not equal to

(x!=10)&&(y!=10)

-Increment and Decrement operators (++, --, ++, --)

These operators are used to make increment or decrement on a variable.


Operator

Example

Equal to

++

x=++i

i=i+1
x=i

--

x=--i

i=i-1
x=i

++

x=i++

x=i
i=i+1

--

x=i--

x=i
i=i-1


 
-Logical Operators (&&, ||, !)
Logical operators are used to evaluate two expressions and return one result.



Operator

Meaning

Example

&&

And

(x>y)&&(y<z)

||

Or

(x>y)||(x<3)

!

Not

!(x==y)

 
-Bitwise operators (~, |, &, <<, >>, ^)
Bitwise operators are used to modify bits that represent the values that they store.
 

Operator

Meaning

Example

~

Reverse bits

x=~2 (result: x=-3)

|

Or

y=2|3(result: y=3)

&

And

y=2&3(result: y=2)

<< 

Shift bits to the left

y=5<<2 (result: y=20)

>> 

Shift bits to the right

y=5>>2(result: y=1)

^

Excusive Or(XOR)

y=2^3(result: y=1)




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2015-05-26



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