Unary operators

Unary operator:- which works upon a single operand.

                                                Example:  unary minus, increment, decrement operators.

Unary minus(-) :-

int a, b=5;

a=-(a);

then the result : a= -5,

increment(++) and decrement(--) operator :-

let   int a=5;

++a;   // is equivalent to a=a+1;

--a;   // is equivalent to a=a-1;

Increment / decrement operators have two variant :

11)      Prefix (++a)

22)      Postfix(a++)

Both add +1 to the variable a, but note the difference in the example given below:

                int a=5,b;

                b = a++;

is equivalent to writing:

                b = a;

                a=a+1;

whereas,

                b = ++a;

is equivalent to writing:

                a=a+1;

                b=a;

so conclusion for above example:  postfix(b=a++;)    the value of b=5.

                                                                    Prefix( b=++a;)  the value of b=6.