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assignment-p-05.c

Problem Statement

Write a C program that defines an array of integers, and includes a user-defined function named reverseArray with the signature void reverseArray(int arr[], int size);. The function should reverse the elements of the array.

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 12 Dec 2025
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Recursion
  • Array
  • Sorting (possible)
  • Iteration

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Source Code

#include <stdio.h>

void inputArray(int[], int);
void reverseArray(int[], int);

int main()
{
    int size;
    printf("How many element do you want to add: ");
    scanf("%d", &size);
    int arr[size];
    inputArray(arr, size);
    reverseArray(arr, size);
    return 0;
}

void inputArray(int arr[], int size)
{
    int i;
    for (i = 0; i < size; i++)
    {
        printf("Enter element %d: ", i + 1);
        scanf("%d", &arr[i]);
    }
}

void reverseArray(int arr[], int size)
{
    int i, j, temp;
    printf("\nBefore Reverse: \n");
    for (i = 0; i < size; i++)
    {
        printf("Position: %d, Value: %d\n", i, arr[i]);
    }
    for (i = 0, j = size - 1; i < j; i++, j--)
    {
        temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }
    printf("\nAfter Reverse: \n");
    for (i = 0; i < size; i++)
    {
        printf("Position: %d, Value: %d\n", i, arr[i]);
    }
}

Explanation

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    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (assignment-p-05.c):

    #include <stdio.h>

    void inputArray(int[], int);
    void reverseArray(int[], int);

    int main()
    {
        int size;
        printf("How many element do you want to add: ");
        scanf("%d", &size);
        int arr[size];
        inputArray(arr, size);
        reverseArray(arr, size);
        return 0;
    }

    void inputArray(int arr[], int size)
    {
        int i;
        for (i = 0; i < size; i++)
        {
            printf("Enter element %d: ", i + 1);
            scanf("%d", &arr[i]);
        }
    }

    void reverseArray(int arr[], int size)
    {
        int i, j, temp;
        printf("\nBefore Reverse: \n");
        for (i = 0; i < size; i++)
        {
            printf("Position: %d, Value: %d\n", i, arr[i]);
        }
        for (i = 0, j = size - 1; i < j; i++, j--)
        {
            temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
        }
        printf("\nAfter Reverse: \n");
        for (i = 0; i < size; i++)
        {
            printf("Position: %d, Value: %d\n", i, arr[i]);
        }
    }