Swap two arrays using pointers

Posted on Apr 12, 2020

C program to swap two arrays using pointers

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void input_array(int arr[], int n);
void print_array(int arr[], int n);

void main()
{
	int arr1[MAX], arr2[MAX];
    int n, i, temp;
    int *ptr1, *ptr2;

    ptr1 = arr1;      //pointer ptr1 points to arr1[0]
    ptr2 = arr2;      //pointer ptr2 points to arr2[0]

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

    printf("\nEnter elements of the first array\n");
    input_array(arr1, n);

    printf("\nEnter elements of the second array\n");
    input_array(arr2, n);

    printf("\nSource array before swapping: ");
    print_array(arr1, n);

    printf("\nDestination array before swapping: ");
    print_array(arr2, n);

    for(i=0;i<n;i++)
    {
        temp = *ptr1;
        *ptr1 = *ptr2;
        *ptr2 = temp;
        ptr1++;
        ptr2++;
    }

    printf("\n\nSource array after swapping: ");
    print_array(arr1, n);

    printf("\nDestination array after swapping: ");
    print_array(arr2, n);

    getch();
}

void input_array(int *arr, int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        scanf("%d",&arr[i]);
    }
}

void print_array(int *arr, int n)
{
    int i;
    for(i=0;i<n;i++)
    {
        printf("%d ",arr[i]);
    }
}

Output

Enter the size of the array     :5

Enter elements of the first array
1
2
3
4
5

Enter elements of the second array
6
7
8
9
0

Source array before swapping: 1 2 3 4 5
Destination array before swapping: 6 7 8 9 0

Source array after swapping: 6 7 8 9 0
Destination array after swapping: 1 2 3 4 5

Explanation