import math
print(math.sin(math.pi/2))
print(math.sqrt(4))
print(math.floor(-2.5))
print(math.sin(math.pi * 2))
print(round(3.5))
print(round(-2.5))
print(math.degrees(1))
print(math.degrees(math.pi)) #弧度转换为角度
print(math.radians(180)) #角度转换为弧度
print(chr(40))
x = input("Enter a character:")
ch = chr(ord(x) + 32)
print(ch)