Variadic functions in C

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    #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 args;
        va_start(args, count);
    
        int result = 0;
        for (int i = 0; i < count; i++) {
            result += va_arg(args, int);
        }
    
        va_end(args);
        return result;
    
    }
    
    int min(int count,...) {
        va_list args;
        va_start(args, count);
    
        int result = va_arg(args, int);
        for (int i = 1; i < count; i++) {
            int current = va_arg(args, int);
            if (current < result) {
                result = current;
            }
        }
    
        va_end(args);
        return result;
    
    }
    
    int max(int count,...) {
        va_list args;
        va_start(args, count);
    
        int result = va_arg(args, int);
        for (int i = 1; i < count; i++) {
            int current = va_arg(args, int);
            if (current > result) {
                result = current;
            }
        }
    
        va_end(args);
        return result;
    
    }
    
    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;
    }