def cal_add(val1, val2):
    """
    足し算を行う関数
    """
    return val1 + val2

def cal_sub(val1, val2):
    """
    引き算を行う関数
    """
    return val1 - val2


# 関数を実行
# add_result1 = cal_add(1, 2)
# add_result2 = cal_add(19, 4)

# sub_result1 = cal_sub(10, 2)
# sub_result2 = cal_sub(20, 9)

# 結果を表示
# print(add_result1)
# print(add_result2)
# print(sub_result1)
# print(sub_result2)
