C Exercises: Create a new array swapping the first and last elements of a given array of integers and length will be least 1

Last update on July 28 2025 12:50:01 (UTC/GMT +8 hours)

48. Swap First and Last in Array

Write a C program to create a new array by swapping the first and last elements of a given array of integers whose length is at least 1.

C Code:

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

// Function prototype for 'print_array'
void print_array(int parray[], int size);

int main(void){
    // Declaration of variables
    int arr_size1; // Size of the original array
    int nums1[] = {1, 5, 7, 9, 11, 13}; // Declaration and initialization of the original array 'nums1'

    // Calculating the size of the original array
    arr_size1 = sizeof(nums1)/sizeof(nums1[0]);

    // Printing elements in the original array
    printf("Elements in original array1 are: ");  
    print_array(nums1, arr_size1);

    // Declaration of the result array with the same size as the original array
    int result[arr_size1];

    // Copying elements from 'nums1' to 'result'
    for (int i = 0; i < arr_size1; i++) {
        result[i] = nums1[i];
    }   

    // Swapping the first and last elements
    int first = nums1[0];
    result[0] = nums1[arr_size1 - 1];
    result[arr_size1 - 1] = first;

    // Printing elements in the new array after swapping
    printf("New array, after swapping first and last elements: ");  
    print_array(result, arr_size1);        
}  

// Definition of the 'print_array' function
void print_array(int parray[], int size)
{
    int i;      
    for( i=0; i<size-1; i++)  
    {  
        // Printing each element with a comma and a space
        printf("%d, ", parray[i]);  
    } 
    // Printing the last element without a comma and space
    printf("%d ", parray[i]);  
    // Printing a new line to separate the elements
    printf("\n");   
}

Sample Output:

Elements in original array1 are: 1, 5, 7, 9, 11, 13 
New array, after swapping first and last elements: 13, 5, 7, 9, 11, 1

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to swap the second and second-to-last elements of an array.
• Write a C program to reverse the first half of an array while keeping the second half unchanged.
• Write a C program to rotate an array by swapping its extreme elements multiple times.
• Write a C program to swap the first element with every element at an even index.

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