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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("\nArray 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
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