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IP-09.c

Problem Statement

Write a program to find the sum of n elements entered by the user. Use dynamic memory allocation (malloc() or calloc()).

Metadata

Property Detail
Author Amit Dutta (amitdutta4255@gmail.com)
License MIT
Difficulty Beginner (index: 3 / 10)

Concepts

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  • Array
  • Pointers
  • Iteration
  • Sorting (possible)
  • Recursion

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Source Code

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

void inputarr(int[], int);
int sum_elem(int[], int);

int main()
{
    int n, *arr;
    printf("How many element do you want to enter: ");
    scanf("%d", &n);
    arr = (int *)malloc(n * sizeof(int));
    inputarr(arr, n);
    printf("\nSum of the %d element(s) = %d", n, sum_elem(arr, n));
    free(arr);
    return 0;
}

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

int sum_elem(int arr[], int n)
{
    int i, sum = 0;
    for (i = 0; i < n; i++)
    {
        sum += arr[i];
    }
    return sum;
}

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 (IP-09.c):

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

    void inputarr(int[], int);
    int sum_elem(int[], int);

    int main()
    {
        int n, *arr;
        printf("How many element do you want to enter: ");
        scanf("%d", &n);
        arr = (int *)malloc(n * sizeof(int));
        inputarr(arr, n);
        printf("\nSum of the %d element(s) = %d", n, sum_elem(arr, n));
        free(arr);
        return 0;
    }

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

    int sum_elem(int arr[], int n)
    {
        int i, sum = 0;
        for (i = 0; i < n; i++)
        {
            sum += arr[i];
        }
        return sum;
    }