# C Program for Insertion Sort On Random Array (Descending Order)

Problem: Sort a random array in descending order using insertion sort.

Que. What modification is required to insertion sort to sort the integers in descending order?
Answer: We just have check whether the integer before key is less than key or not. If it is, we have to swap it.

## C program for insertion sort on random array in descending order

/* Aim: C Program to sort a random array in descending order using insertion sort */

#include<stdio.h>
#include<stdlib.h>

void DisplayArray(int arr[],int n)
{
int i;

for(i=0;i<n;i++)
printf(" %d ",arr[i]);
}

void Generate(int *arr, int n)
{
int i;

for(i=0;i<n;i++)
arr[i]=rand()%100;

}

void InsertionSort(int arr[], int n)
{

int Key,i,j;

for(i=1;i<n;i++)
{

Key=arr[i];

j=i-1;

while( j>=0 && arr[j]<key)
{
arr[j+1]=arr[j];
j=j-1;
}

arr[j+1]=Key;

}
}

int main()
{
int arr[100],n;

printf("\n Enter the size of array:- ");
scanf("%d",&n);

Generate(arr,n); // Generating a random array

printf("\n The random array: ");
DisplayArray(arr,n); // Displaying the array

InsertionSort(arr,n); // Sorting the array

printf("\n The sorted array: ");
DisplayArray(arr,n); // Displaying the sorted array

printf("\n");

return 0;
}

### Output:

Enter the size of array:- 5

The random array:  83  86  77  15  93
The sorted array:  93  86  83  77  15