`luc055.c`¶

Problem Statement

Twenty-five numbers are entered from the keyboard into an array. Write a program to find out how many of them are positive, how many are negative, how many are even and how many odd.

Metadata¶

Property	Detail
Author	Amit Dutta amitdutta4255@gmail.com
Date	08 Feb 2026
License	MIT License (See the LICENSE file for details)
Difficulty	Beginner (index: 1 / 10)

Concepts¶

Beta Feature

This concept detection system is still in beta and may occasionally show incorrect or incomplete results.

Recursion
Array
Iteration

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Source Code¶

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

int main()
{
    int arr[25], i;
    int pos = 0, neg = 0, even = 0, odd = 0;

    printf("Enter 25 integers:\n");
    for (i = 0; i < 25; i++)
    {
        scanf("%d", &arr[i]);

        if (arr[i] > 0)
            pos++;
        else if (arr[i] < 0)
            neg++;

        if (arr[i] % 2 == 0)
            even++;
        else
            odd++;
    }

    printf("\nResults:\n");
    printf("Positive: %d\n", pos);
    printf("Negative: %d\n", neg);
    printf("Even: %d\n", even);
    printf("Odd: %d\n", odd);

    return 0;
}

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".

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    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 (luc055.c):

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

    int main()
    {
        int arr[25], i;
        int pos = 0, neg = 0, even = 0, odd = 0;

        printf("Enter 25 integers:\n");
        for (i = 0; i < 25; i++)
        {
            scanf("%d", &arr[i]);

            if (arr[i] > 0)
                pos++;
            else if (arr[i] < 0)
                neg++;

            if (arr[i] % 2 == 0)
                even++;
            else
                odd++;
        }

        printf("\nResults:\n");
        printf("Positive: %d\n", pos);
        printf("Negative: %d\n", neg);
        printf("Even: %d\n", even);
        printf("Odd: %d\n", odd);

        return 0;
    }

luc055.c¶