Describe one way that the program in Figure 1 could be made more robust.

Figure 1

def calculate_average(total_score, num_tests):
    if num_tests == 0:
        return 0
    return total_score / num_tests

score = int(input("Enter total score: "))
tests = int(input("Enter number of tests: "))

average = calculate_average(score, tests)
print(f"Average score is: {average}")