Hello, OnlineGDB Q&A section lets you put your programming query to fellow community users. Asking a solution for whole assignment is strictly not allowed. You may ask for help where you are stuck. Try to add as much information as possible so that fellow users can know about your problem statement easily.

I have a question

+5 votes
asked Nov 18, 2020 by Debes─Ślis Dangaus (170 points)
I have to make a program which: Enter an integer N. Enter N integers. Find N / 3 or more duplicate numbers between the entered numbers.

And I'm lost. I did something like this:

#include <stdio.h>

int main(int argc, char** argv)


int number;


    printf("Enter an integer: ");  


    scanf("%d", &number);


struct eleCount {

    int element;

    int count;


struct eleCount temp[];

Could you please help?

1 Answer

+1 vote
answered Nov 20, 2020 by Peter Minarik (88,520 points)

So far so good. You asked the user to enter the number N and you already read it.

The next step is to repeat reading N numbers. For that you should use a loop (for, while or do-while). In this loop, you ask for the numbers one by one (just like you did for N -- number -- above).

When done, you should look for duplicates. I leave this for you for think about how to do it. (There could be many ways).

I've created the skeleton of the program. Please, give it a try and try to fill the missing parts.

#include <stdio.h>

int main()
    // Instructions to the user + asking for N
    printf("The program will read N number of integers then find duplicates in them.\n");
    printf("Please, enter N (how many numbers you'll want to check for duplicates): ");
    int count;
    scanf("%d", &count);
    int numbers[count]; // Now, that we know how many numbers we need, we can initialise the numbers array for the right count of elements
    // Reading the N numbers
    for (int i = 0; i < count; i++)
        // TODO: Implement reading the numbers
        //       1. Ask the user to enter the "i"th number.
        //       2. Read the number and store it in the "numbers" array.
        // Note: you can access the "i"th element of the array "numbers" as: numbers[i]
    // Searching for duplicates
    // TODO: Implement searching for duplicates
    //       1. Find a duplicate.
    //       2. Print it to the user.
    //       3. Go back to 1. or finish, when there are no numbers left.

    return 0;

If you get stuck, please come back and I (or others) will be more than happy to help.

Good luck! :)

Welcome to OnlineGDB Q&A, where you can ask questions related to programming and OnlineGDB IDE and and receive answers from other members of the community.