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Write a C Program to delete the duplicate numbers in an array
Let the user enter the numbers in an array, which contains duplicate elements.
Now, let’s write a code to delete the repeated numbers or elements in an array and make an array with unique elements without duplicates
For example,
An example is explained below −
- User input is 12, 30, 12, 45, 67, 30.
- Output is 12, 30, 45, 67 (after deleting duplicates).
Program
Following is the C program to delete the duplicate numbers in an array −
#include <stdio.h>
#define MAX 100 // Maximum size of the array
int main(){
int array[MAX]; // Declares an array of size 100
int size;
int i, j, k; // Loop variables
/* Input size of the array */
printf("enter the size of array : ");
scanf("%d", &size);
/* Input elements in the array */
printf("Enter elements in an array : ");
for(i=0; i<size; i++){
scanf("%d", &array[i]);
}
/*find the duplicate elements in an array:
for(i=0; i<size; i++){
for(j=i+1; j<size; j++){
/* If any duplicate found */
if(array[i] == array[j]){
/* Delete the current duplicate element */
for(k=j; k<size; k++){
array[k] = array[k + 1];
}
/* Decrement size after removing duplicate element */
size--;
/* If shifting of elements occur then don't increment j */
j--;
}
}
}
printf("
Array elements after deleting duplicates : ");/*print an array after deleting the duplicate elements.
for(i=0; i<size; i++){
printf("%d\t", array[i]);
}
return 0;
}Output
The output is as follows −
enter the size of array : 10 Enter elements in an array : 23 12 34 56 23 12 56 78 45 56 Array elements after deleting duplicates : 23 12 34 56 78 45
Updated on: 15-Mar-2021
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