C++ program to sort an array in ascending and descending order

October 7, 2022

Sort First half in Ascending and Second half in descending order in C++

Here, in this page we will discuss the program to sort first half in ascending and second half in descending order in C++ programming language. We are given with an array and need to print the required sorted array in the desired way.

Here, in this page we will discuss two different methods to sort the given array such that it’s first half is in ascending order and second half in descending order.

Method 1 : Using bubble sort
Method 2 : Sort the entire array then, print first half in ascending and second half in descending.

Example

Input : arr[6] = [1, 90, 34, 89, 7, 9]
Output : 1 7 9 90 89 34

Method 1 :

This program takes a lot of inspiration from the bubble sort.

Apart from the fact that we divide the array into two halves. In the first half we sort in ascending order and in the second we sort in descending order.

Method 1 : Code in C++

Run

#include<bits/stdc++.h>
using namespace std;
void ascDecFunc(int a[], int n)
{
   int temp;
   for(int i=0;i < n-1;i++)
   {
     for(int j = 0;j < n/2; j++) { if(a[j]>a[j+1])
           {
             temp=a[j];
             a[j]=a[j+1];
             a[j+1]=temp;
           }
      }

      for(int j = n/2;j < n-1; j++)
      {
          if(a[j] < a[j+1])
          {
             temp=a[j];
             a[j]=a[j+1];
             a[j+1]=temp;
          }
      }
   }

   for(int i = 0; i < n; i++)
      cout<<a[i]<<" ";
}

int main()
{
    int arr[] = {3, 2, 4, 1, 10, 30, 40, 20};
    int len = sizeof(arr) / sizeof(arr[0]);
    ascDecFunc(arr, len);

    return 0;
}

Output

1 2 3 4 40 30 20 10

Calculate the sum of elements in an array

Reverse an Array

Sort the elements of an array

Finding the frequency of elements in an array

Sorting elements of an array by frequency

Method 2 :

Sort the given array.
Run a loop up to half the length of the array and print the elements of the sorted array.
Run a loop from the last index of the array to the middle of the array and print the elements in reverse order.

Method 2 : Code in C++

Run

#include<bits/stdc++.h>
using namespace std;

void ascDecFunc(int a[], int n)
{
   sort(a, a+n);
   
   // printing first half in ascending order
   for (int i = 0; i < n / 2; i++)
        cout<<a[i]<<" "; // printing second half in descending order 
   for (int j = n - 1; j >= n / 2; j--)
        cout<<a[j]<<" ";

}

int main()
{
    int arr[] = {3, 2, 4, 1, 10, 30, 40, 20};
    int len = sizeof(arr) / sizeof(arr[0]);
    ascDecFunc(arr, len);

    return 0;
}

Output

1 2 3 4 40 30 20 10

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7 comments on “C++ program to sort an array in ascending and descending order”

Mayank
#include
using namespace std;

int main()
{
int arr[]={3, 2, 4, 1, 10, 30, 40, 20};
int size = sizeof(arr)/sizeof(arr[0]);
sort(arr,arr+size);
int mid = size/2;
int s = mid;
int e = size-1;
while(s<e)
{
swap(arr[s],arr[e]);
s++;
e–;
}
for(int i=0;i<size;i++)
{
cout<<arr[i]<<" ";
}
return 0;
}

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Hey, Our mentors would be happy to help you with this technical queries on Discord

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Gaurav Kumar
program to sort an array in ascending and descending order by taking input from the user without using temp variable

#include

#include

#include

#include
#include

#include

#include

using namespace std;

int main (){

int n;

cout << "enter the no of element in an array" <> n;

vector arr;

int val;

for (int i = 0; i > val;

arr.push_back(val);
}

int size = arr.size();

int start = 0;

int end = arr.size() – 1;

int mid = size/2;

for(int i = start;i<=end;i++){

for (int j = 0; j arr[j+1]){

swap(arr[j] , arr[j+1]);

}
}

for (int k = mid; k<=end; k++)
{
if (arr[k] < arr[k + 1])
{

swap(arr[k], arr[k+1]);
}
}

}

for (int k = 0; k < arr.size(); k++)
{

cout << arr[k] << " ";
}

cout << endl;
}

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Gyanendra
import java.util.*;
public class Main
{
public static void main (String[]args)
{

int[] arr= {3, 2, 4, 1, 10, 30, 40, 20};

Arrays.sort(arr);

for(int i=0;i=arr.length/2;i–){
System.out.print(arr[i]+” “);
}
}
}

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Aman
#include
using namespace std;
void shorted(int arr[], int n){
int temp, i , j;
for(int i=0; i<n; i++){
for(int j = i +1 ; j arr[j]){
temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;

}
}
}
}
void halfarray(int arr[], int n){
int first = n/2;
int last = n-1, temp;
while(first<last){
temp = arr[first];
arr[first] = arr[last];
arr[last] = temp;
++first;
–last;

}

}

int main(){
cout<>len;
int arr[len];
cout<>n;
cout<<"enter your array elemant : ";
for(int i = 0 ; i>arr[i];
}
shorted(arr, n);
halfarray(arr,n);
cout<<"Sort First half in Ascending and Second half in descending order in C++ : ";
for(int i = 0 ; i<n; i++){
cout<<arr[i]<<" ";
}
return 0;

}

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Satya Prakash
//PROGRAM TO PRINT FIRST HALF IN ASCENDING AND SECOND HALF IN DESCENDING

#include
using namespace std;
int main()
{
int a[] = {1,2,3,4,5,6,7,8,9,10};
int n = sizeof(a)/sizeof(a[0]);
int temp;
for(int i=0;i<n;i++)
{
for(int j=0;j<=n/2;j++)
{
if(a[i]<a[j])
{
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
for(int j=n/2;ja[j])
{
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
for(int i=0;i<n;i++)
{
cout<<a[i]<<" ";
}
}

1

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Bibhudutta
#include
using namespace std;

void ascending(int a[],int n){
for(int i=0;i<n;i++){
for(int j=i+1;j<n;j++){
if(a[j]<a[i]){
int temp=a[j];
a[j]=a[i];
a[i]=temp;

}
}
}
for(int i=0;i<n;i++){
cout<<a[i]<<" ";
}
}

void descending(int a[],int n){
for(int i=0;i<n;i++){
for(int j=i+1;ja[i]){
int temp=a[j];
a[j]=a[i];
a[i]=temp;

}
}
}
for(int i=0;i<n;i++){
cout<<a[i]<>n;
int a[n];

for(int i=0;i>a[i];
}
cout<<"Ascending :";
ascending(a,n);

cout<<endl;
cout<<"Descending :";
descending(a,n);
return 0;
}

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