#include <stdio.h>

unsigned int multiply(unsigned int a, unsigned int b);

/**
 * Multiplies two unsigned int values
 * @param unsigned int a
    The value of the multiplier a (0-4294967295)
 * @param unsigned int b
    The value of the multiplicand b (0-4294967295)
 * @return unsigned int
    The answer of a times b given that a * b < 4294967295
 */

// // This function must be implemented in LEGv7 Pinky assembly
// unsigned int multiply(unsigned int a, unsigned int b)
// {
//     unsigned int m = 0;
//     for (unsigned int i = 0; i != a; i++)
//     {
//         m = m + b;
//     }
//     return m;
// }

int main()
{
    extern void initialise_monitor_handles(void);
    initialise_monitor_handles();

    unsigned int a[] = {0, 1, 0, 1, 2000,      2,     10000,          1 ,      65535 };
    unsigned int b[] = {0, 0, 1, 1,    2,  65535,     65535, 4294967295u,      65535 };
    unsigned int r[] = {0, 0, 0, 1, 4000, 131070, 655350000, 4294967295u, 4294836225u};

    for (size_t i = 0; i != sizeof(a)/sizeof(a[0]); i++)
    {
        printf("%u x %u: ", a[i], b[i]);
        unsigned int result = multiply(a[i], b[i]);
        unsigned int correct = r[i];
        if (result != correct)
        {
            printf("Failed, function returned %u but the correct answer is %u\n", result, correct);
        }
        else
        {
            printf("Passed, %u\n", result);
        }
    }
    return 0;
}