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

C Formatted IO Functions

Input data or output results are formatted as per requirement. Formatted function improves the readability of the input and output. Formatted functions can be used to read and write data of all data type(char, int, float, double). Formatted input and output functions require format specifiers(%c, %d, %f, %lf) to identify the type of data.

scanf() Function

Scanf function reads all types of data value from input devices (or) from a file. The address operator '&' is to indicate the memory location of the variable. This memory location is used to store the data which is read through keyboard.

scanf() Function Program

#include <stdio.h> //header file section
int main()
int a, b, c;
printf("Enter the value of a = ");
scanf("%d",&a) ; //read value a through keyboard
printf("\nEnter the value of b = ");
scanf("%d",&b); //read value b through keyboard
c = a + b;
printf("\na + b = %d ",c); //Print the sum of two value a and b
return 0;
  • Enter the value of a = 6
  • Enter the value of b = 4
  • a + b = 10

Width specifier program

#include <stdio.h> //header file section
int main()
printf("\n%.2s","abcdefg ");
printf("\n%.3s","abcdefg ");
printf("\n%.4s","abcdefg ");
printf("\n%.5s","abcdefg ");
printf("\n%.6s","abcdefg ");
return 0;
  • ab
  • abc
  • abcd
  • abcde
  • abcdef


Output itself shows the process done by %.2s, %.3s, etc..

scanf to Get Input

#include <stdio.h> //header file section
int main()
float a, b, c, d;
printf("Enter three float numbers:\n ");
scanf("\n %f %f %f ",&a,&b,&c);
d = (a + b + c)/3;
printf("\nAverage of given number is %f ",d);
return 0;
  • Enter three float numbers:
  • 4.5
  • 4.5
  • 5.0
  • Average of given number is 4.666667


Here, three float variables a, b and c read through scanf() function. The resultant average value is stored in a variable d.

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