An operator is a symbol that is used to perform operations. There can be many types of operations like arithmetic, logical, bitwise etc. There are following types of operators to perform different types of operations in C language.

  • Arithmetic Operators
  • Relational Operators
  • Shift Operators
  • Logical Operators
  • Bitwise Operators
  • Ternary or Conditional Operators
  • Assignment Operator
  • Misc Operator
  • Precedence of Operators in C
    The precedence of operator species that which operator will be evaluated first and next. The associativity specifies the operators direction to be evaluated, it may be left to right or right to left.
    Let's understand the precedence by the example given below:
    int value=20+30*10;
    The value variable will contain 320 because * (multiplicative operator) is evaluated before + (additive operator).

    The precedence and associativity of C operators is given below:
    Category OperatorAssociativity
    Postfix() [] -> . ++ - - Left to right
    Unary + - ! ~ ++ - - (type)* & sizeof Right to left
    Multiplicative * / %Left to right
    Additive + - Left to right
    Shift << >> Left to right
    Relational < <= > >= Left to right
    Equality == != Left to right
    Bitwise AND& Left to right
    Bitwise XOR ^ Left to right
    Bitwise OR | Left to right
    Logical AND&& Left to right
    Logical OR || Left to right
    Conditional?: Right to left
    Assignment = += -= *= /= %=>>= <<= &= ^= |=Right to left
    Comma , Left to right

    Keyword in C

    A keyword is a reserved word. You cannot use it as a variable name, constant name etc. There are only 32 reserved words (keywords) in C language.

    A list of 32 keywords in c language is given below:

    double else enum extern floatforgotoif
    int longregisterreturnshortsignedsizeofstatic

    Comments in C

    Comments in C language are used to provide information about lines of code. It is widely used for documenting code.
    There are 2 types of comments in C language.
  • Single Line Comments
  • Multi Line Comments
  • Single Line Comments

    Single line comments are represented by double slash \\.
    Let's see an example of single line comment in C.
    #include <stdio.h>
    void main( ) {           
        //printing information  
    printf("Hello Catchmecoder");  
    Hello Catchmecoder
    Even you can place comment after statement.
    For example:
    printf("Hello Catchmecoder"); //printing information

    Mult Line Comments

    Multi line comments are represented by slash asterisk \* ... *\. It can occupy many lines of code but it can't be nested. Syntax:
    to be commented 
    Example of multi line comment in C.
    #include <stdio.h>
    void main( ) {    
    printf("Hello Catchmecoder");     
    Hello Catchmecoder