C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Top C Interview Questions

26. Define functions in C?

In general terms, a function is also called a subroutine in some other languages like php, python and so on. Function is a self contained block of code that performs a specific task. A programmer define a function using its predefined syntax, a programmer can then call that function from elsewhere in your program. Refer For More C Functions

27. Why use functions in C?

  • They avoid duplicating codes.
  • They make it easier to eliminate errors.
  • Function help you break down a big project.
  • 28. How functions works in a C program?

    Program think of a function as a black box. The code that calls a function doesn't need to know what's inside the function, it just uses the function to get the job done.

    #include <stdio.h>
    int add(int, int );     //function declaration
    int main()
    //main function definition
    int a = 5, b = 10;
    int sum;
    printf("The value of a and b : %d %d ", a, b);
    sum = add(a, b);    //function call
    printf("\nsum = %d ", sum);
    // function definition
    int add(int a, int b)
    int c;
    c = a + b;
    return c;    //returns a integer value to the calling function

    29. What is function return type?

    The return type is the data type of the value which is given back to the calling function.

    30. What is arguments or parameters in C?

    C allows programmers to pass information to the called function from the calling function by using parameters. These parameters are variables of data type.

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