Variadic functions in C – Hacker Rank Solution

Variadic functions in C - Hacker Rank Solution
Variadic functions in C – Hacker Rank Solution

Variadic functions are functions which take a variable number of arguments. In C programming, a variadic function will contribute to the flexibility of the program that you are developing.

The declaration of a variadic function starts with the declaration of at least one named variable, and uses an ellipsis as the last parameter, e.g. 

int printf(const char* format, ...);

In this problem, you will implement three variadic functions named sum(), min() and max() to calculate sums, minima, maxima of a variable number of arguments. The first argument passed to the variadic function is the count of the number of arguments, which is followed by the arguments themselves.


Input Format :

  • The first line of the input consists of an integer number_of_test_cases.
  • Each test case tests the logic of your code by sending a test implementation of 3, 5 and 10 elements respectively.
  • You can test your code against sample/custom input.
  • The error log prints the parameters which are passed to the test implementation. It also prints the sum, minimum element and maximum element corresponding to your code.

Constraints :

  • 1<= number_of_test_cases <= 50
  • 1<= element <= 1000000

Output Format :

“Correct Answer” is printed corresponding to each correct execution of a test implementation.”Wrong Answer” is printed otherwise.


Sample Input 0 :

1

Sample Output 0 :

Correct Answer
Correct Answer
Correct Answer


Variadic functions in C – Hacker Rank Solution

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MIN_ELEMENT 1
#define MAX_ELEMENT 1000000
int sum(int count, ...)
{
    va_list arr;
    int t = 0;
    va_start(arr, count);
    while(count--){
        t += va_arg(arr, int);
    }
    return t;
}
int min(int count, ...)
{
    va_list arr;
    int mn = MIN_ELEMENT;
    va_start(arr, count);
    while(count--){
        if(mn > va_arg(arr, int))
            mn = va_arg(arr, int);
    }
    return mn;
}
int max(int count, ...)
{
    va_list arr;
    int mx = MAX_ELEMENT;
    va_start(arr, count);
    while(count--){
        if(mx < va_arg(arr, int))
            mx = va_arg(arr, int);
    }
    return mx;
}
int test_implementations_by_sending_three_elements()
{
    srand(time(NULL));
    int elements[3];
    elements[0] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[1] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[2] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    fprintf(stderr, "Sending following three elements:\n");
    for (int i = 0; i < 3; i++)
    {
        fprintf(stderr, "%d\n", elements[i]);
    }
    int elements_sum = sum(3, elements[0], elements[1], elements[2]);
    int minimum_element = min(3, elements[0], elements[1], elements[2]);
    int maximum_element = max(3, elements[0], elements[1], elements[2]);
    fprintf(stderr, "Your output is:\n");
    fprintf(stderr, "Elements sum is %d\n", elements_sum);
    fprintf(stderr, "Minimum element is %d\n", minimum_element);
    fprintf(stderr, "Maximum element is %d\n\n", maximum_element);
    int expected_elements_sum = 0;
    for (int i = 0; i < 3; i++)
    {
        if (elements[i] < minimum_element)
        {
            return 0;
        }
        if (elements[i] > maximum_element)
        {
            return 0;
        }
        expected_elements_sum += elements[i];
    }
    return elements_sum == expected_elements_sum;
}
int test_implementations_by_sending_five_elements()
{
    srand(time(NULL));
    int elements[5];
    elements[0] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[1] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[2] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[3] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[4] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    fprintf(stderr, "Sending following five elements:\n");
    for (int i = 0; i < 5; i++)
    {
        fprintf(stderr, "%d\n", elements[i]);
    }
    int elements_sum = sum(5, elements[0], elements[1], elements[2], elements[3], elements[4]);
    int minimum_element = min(5, elements[0], elements[1], elements[2], elements[3], elements[4]);
    int maximum_element = max(5, elements[0], elements[1], elements[2], elements[3], elements[4]);
    fprintf(stderr, "Your output is:\n");
    fprintf(stderr, "Elements sum is %d\n", elements_sum);
    fprintf(stderr, "Minimum element is %d\n", minimum_element);
    fprintf(stderr, "Maximum element is %d\n\n", maximum_element);
    int expected_elements_sum = 0;
    for (int i = 0; i < 5; i++)
    {
        if (elements[i] < minimum_element)
        {
            return 0;
        }
        if (elements[i] > maximum_element)
        {
            return 0;
        }
        expected_elements_sum += elements[i];
    }
    return elements_sum == expected_elements_sum;
}
int test_implementations_by_sending_ten_elements()
{
    srand(time(NULL));
    int elements[10];
    elements[0] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[1] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[2] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[3] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[4] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[5] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[6] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[7] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[8] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    elements[9] = rand() % (MAX_ELEMENT - MIN_ELEMENT + 1) + MIN_ELEMENT;
    fprintf(stderr, "Sending following ten elements:\n");
    for (int i = 0; i < 10; i++)
    {
        fprintf(stderr, "%d\n", elements[i]);
    }
    int elements_sum = sum(10, elements[0], elements[1], elements[2], elements[3], elements[4],
                           elements[5], elements[6], elements[7], elements[8], elements[9]);
    int minimum_element = min(10, elements[0], elements[1], elements[2], elements[3], elements[4],
                           elements[5], elements[6], elements[7], elements[8], elements[9]);
    int maximum_element = max(10, elements[0], elements[1], elements[2], elements[3], elements[4],
                           elements[5], elements[6], elements[7], elements[8], elements[9]);
    fprintf(stderr, "Your output is:\n");
    fprintf(stderr, "Elements sum is %d\n", elements_sum);
    fprintf(stderr, "Minimum element is %d\n", minimum_element);
    fprintf(stderr, "Maximum element is %d\n\n", maximum_element);
    int expected_elements_sum = 0;
    for (int i = 0; i < 10; i++)
    {
        if (elements[i] < minimum_element)
        {
            return 0;
        }
        if (elements[i] > maximum_element)
        {
            return 0;
        }
        expected_elements_sum += elements[i];
    }
    return elements_sum == expected_elements_sum;
}
int main ()
{
    int number_of_test_cases;
    scanf("%d", &number_of_test_cases);
    while (number_of_test_cases--)
    {
        if (test_implementations_by_sending_three_elements())
        {
            printf("Correct Answer\n");
        }
        else
        {
            printf("Wrong Answer\n");
        }
        if (test_implementations_by_sending_five_elements())
        {
            printf("Correct Answer\n");
        }
        else
        {
            printf("Wrong Answer\n");
        }
        if (test_implementations_by_sending_ten_elements())
        {
            printf("Correct Answer\n");
        }
        else
        {
            printf("Wrong Answer\n");
        }
    }
    return 0;
}

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