Execution of C Program History Structure of C Program Variables and Keywords : Character Set Identifier Variable Keywords Escape Sequence Characters Constants : Real Constant Integer Constant Character Constant String Constant Data Types : Data Types Qualifier Enum Typedef Operators : Assignment Operator Arithmetic Operators Logical Operators Relational Operators Shorthand Operators Unary Operators Conditional / Ternary Operator Bitwise Operators Operator Precedence and Associativity If Statement If-Else Statement Nested If-Else Switch Case Looping Statements Conditional statement (if, if-else, else if, nested if) Looping (for , while, do-while) Break Statement Continue Statement Goto Functions : Function call by passing value Function call by returning value Function call by passing and returning value Recursion Storage Classes : Storage Classes Automatic Storage Class (auto) Register Storage Class (register) Static Storage Class (static) External Storage Class (extern) Array : Array Single / One Dimensional Array Two Dimensional Array Structure : Structure Array in Structures Structure with Array Difference between array and structure Pointer Union : Union Difference between structure and union Strings File Handling