# 数字计算
# 字符串、整数、浮点数
a = 2
b = 6
c = 4

# 加减乘除
print(a + b - c)
print(a * b / c)

# 导入数学计算库
import math

# 开平方
print(math.sqrt(c))

# 圆周率
print(math.pi)

# 向下取整
print(math.floor(4.98))

# 向上取整
print(math.ceil(4.98))