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Expressions in C

Expressions in the C Language:


In the C programming language, an expression is a unit that produces a value or result. It is an important part of programming because expressions are used for calculations, decision-making, and data processing. An expression in C is a combination of variables, constants, operators, and function calls.

Components of an Expression:
Operands: These are the entities on which an operation is performed. They can be variables, constants, or function calls.
Operators: These are symbols used to perform various operations on operands, such as arithmetic, relational, logical, bitwise, etc.

Types of Expressions:
  1. Arithmetic Expressions: Used to represent mathematical operations.
  2. Relational Expressions: Used to establish a relationship between two operands. The result is a boolean value (true or false).
  3. Logical Expressions: Used to check multiple conditions. The result is also a boolean value.
  4. Assignment Expressions: Used to assign a value to a variable.
  5. Bitwise Expressions: Used to perform operations on bits.
  6. Conditional Expressions (Ternary Operator): Used to choose a value based on a condition.
  7. Function Call Expressions: Where a function is called and its result is obtained.
  8. Comma Expressions: Where two or more expressions are evaluated together. The result is always the result of the last expression.

Expression Evaluation:
When a compiler reads an expression, it evaluates it and produces a result. Key points in evaluation are:
Precedence: Determines which operator is executed first in an expression with multiple operators.
Associativity: Determines the direction of evaluation (left-to-right or right-to-left) when multiple operators have the same precedence.

In this Chapter

Expressions in C
What is an Array & Types of Arrays
What is Memory Allocation and its Types
Introduction to C
Variables in C
Call by Value & Call by Reference
Flowcharts in C
First Program in C
malloc() & calloc() in C
Control Statements in C
Algorithms in C
Tokens & Keywords in C
File Handling in C
Operators in C
Parameter & Argument Passing in C
Pointers in C
Debugging in C
Recursion in C
Unions in C
Header Files in C