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assignment-p-15.c

Problem Statement

Write a C program that reads a sequence of integers from a file named 'input.txt'. This program should segregate the odd numbers from the even numbers and store the odd numbers in a new file named 'ODDFile.txt' while storing the even numbers in another file named 'EVENFile.txt'

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: 3 / 10)

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Source Code

#include <stdio.h>

#define FILENAME "input.txt"
#define ODDFILE "ODDFile.txt"
#define EVENFILE "EVENFile.txt"

int main()
{
    FILE *input = NULL;
    FILE *oddfile = NULL;
    FILE *evenfile = NULL;
    int num;

    input = fopen(FILENAME, "r");
    if (input == NULL)
    {
        printf("\nCould not open the file: %s", FILENAME);
        return 1;
    }

    oddfile = fopen(ODDFILE, "w");
    if (oddfile == NULL)
    {
        printf("\nCould not open the file: %s", ODDFILE);
        return 1;
    }

    evenfile = fopen(EVENFILE, "w");
    if (evenfile == NULL)
    {
        printf("\nCould not open the file: %s", EVENFILE);
        return 1;
    }

    while (fscanf(input, "%d", &num) == 1)
    {
        if (num % 2 == 0)
        {
            fprintf(evenfile, "%d ", num);
        }
        else
        {
            fprintf(oddfile, "%d ", num);
        }
    }

    printf("Successfully processed numbers from %s.\n", FILENAME);
    printf("Odd numbers written to %s.\n", ODDFILE);
    printf("Even numbers written to %s.\n", EVENFILE);

    fclose(input);
    fclose(oddfile);
    fclose(evenfile);

    return 0;
}

Explanation

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    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 (assignment-p-15.c):

    #include <stdio.h>

    #define FILENAME "input.txt"
    #define ODDFILE "ODDFile.txt"
    #define EVENFILE "EVENFile.txt"

    int main()
    {
        FILE *input = NULL;
        FILE *oddfile = NULL;
        FILE *evenfile = NULL;
        int num;

        input = fopen(FILENAME, "r");
        if (input == NULL)
        {
            printf("\nCould not open the file: %s", FILENAME);
            return 1;
        }

        oddfile = fopen(ODDFILE, "w");
        if (oddfile == NULL)
        {
            printf("\nCould not open the file: %s", ODDFILE);
            return 1;
        }

        evenfile = fopen(EVENFILE, "w");
        if (evenfile == NULL)
        {
            printf("\nCould not open the file: %s", EVENFILE);
            return 1;
        }

        while (fscanf(input, "%d", &num) == 1)
        {
            if (num % 2 == 0)
            {
                fprintf(evenfile, "%d ", num);
            }
            else
            {
                fprintf(oddfile, "%d ", num);
            }
        }

        printf("Successfully processed numbers from %s.\n", FILENAME);
        printf("Odd numbers written to %s.\n", ODDFILE);
        printf("Even numbers written to %s.\n", EVENFILE);

        fclose(input);
        fclose(oddfile);
        fclose(evenfile);

        return 0;
    }