print ( '加法=1 减法=2 乘法=3 除法=4' ) |
x = int ( input ( '>' )) |
y = int ( input ( '请输入一个数:' )) |
z = int ( input ( '请输入另一个数:' )) |
a = y + z |
b = y - z |
c = y * z |
d = y / z |
if x = = 1 : |
print (a) |
elif x = = 2 : |
print (b) |
elif x = = 3 : |
print (c) |
elif x = = 4 : |
print (d) |
else : |
print ( "只能输入1~4" ) |