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

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

Remove Duplicate Element From an Array

C Finding Duplicate Element in an Array

Here your task to collect any number of elements in an array and you have to display an array with non duplicate elements.

C Program - Remove Duplicate Elements From an Array

Let us write our own c program to Remove Duplicate Elements From An Array

#include <stdio.h>
int main()
int i, j, k, flag = 0, a[10], n;
printf("Enter array size: ");
for(i = 0;i < n;i++)
scanf("%d ",&a[i]);
for(i = 0;i < n;i++)
for(j = i-1;j >= 0;j--)
if(a[i] == a[j])
flag = 1;
if(flag == 0)
flag = 0;
return 0;
Enter array size : 6
1 1 2 3 4 5
1 2 3 4 5


The above program looks very simple, here goes the logic

  • First element will never be a duplicate element.
  • Compare second element with first element for duplicate check, if it is not a duplicate element then print else skip.
  • Compare third element with first and second element for duplicate check, if it is not a duplicate element then print else skip.
  • Repeat the step until you reach the last element in an array.

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