c programming operator using tips

1.      Precedence decides which operator should be perform first

         Example:-

          P = 6 / 2 + 4 * 3

            (Operator /  and  * enjoy same priority  so it is evaluated from  Left to Right)

          P = 6 / 2  + 4 * 3   [ Operation  of   / ]

          P = 3 +  4 * 3        [ Operation of *]

     

          P = 3 + 12            [ Operation of +]

  

          P =  15

      2. Associative determine the order of evaluation

3. Left to Right  & Right to left are two associative rules used when two or more than two same  operators enjoy the same Priority.

4. There is no operators in C to find out the value of “ A  raised to  power B”.

5. comma ( ,) operator is the lowest priority form the group of 45 operator.

6. parenthesis ( ), [], . and -> having highest priority from group of 45 operators .

7. Sizeof( ) is an operator and a keyword which look like function.

8. Modules ( %) is an operator that works with only integral type.

 Example:-

      Float x ;

     X = 10.0 % 3 ;

     Printf(“ %f ”, x);  //( wrong approach )

 Int x ;

X = 10 / 3 ;

Printf ( “%d”, x) ;  // right approach

9. C does not allow “culprits”  such as ** ,//

  example :

int a=4;

a**;

printf(“%d”, a);

10. unary operator (++,--) Can apply to variable not to constants.

11.unary operator plus (+) is dummy operator.

    Int a=6;

   +a;

printf (“%d”,a);

12. some time ternary operator (?:) replace the conditional if statement.

Like  example:-

Int a=6;

If(a>5)

 Printf(“hello”);

Else

Printf(“hi”);

(a>=5)?printf(“hello”):printf(“hi”);

13.comma and parenthesis are twin brothers.

Example :

While ( (P=getch() )!= EOF)

While ( p=getch() ,!=EOF )

14. Return Keyword cannot be used with ternary operator (?:)

  void main()

  {

 int p=5;

p>65540? Return1 : return 0;

}

15.the bit wise operator work with only integer and character .

16. continuous triple plus (+++) is allowed but not more or less.

  For example:

   Int a=3 b;

    B = a+++5; // means b = a ++ + 5  which is 8

17.      More then one + is allow in same statement but space matter a lot between operator .

18.      ## operator helps to concatenate between tokens

#define m (x) printf(“yes %d”, a##x)

void main()

{

int a1=32;

int a2=30;

m(1);

m(2);

}

19.      Turboc used many punctuation know as separators like (), [],.. etc.

20.      caste operator is an operator which is a signal (force) to compiler to convert one caste to other caste .

         example :-  float x; x =  (float) 5/2;

 21. all operators in C can be overload in c++ but except ?: , .* :: etc