第二章 分支語句 最適宜運動心率

代碼：

age=int(input("Your age is:"))
HRrest=float(input("Your HRrest is:"))
gender=str(input ("Your gender is:"))
if gender=="male":
    n=220
else:
    n=210
low=(n-age-HRrest)*0.6+HRrest
high=(n-age-HRrest)*0.8+HRrest
print("Your suit HRrest is between ",low,"~",high)

效果：

[root@localhost 2]# python p2_hrrest.py
Your age is:16
Your HRrest is:71
Your gender is:male
Your suit HRrest is between  150.8 ~ 177.4
[root@localhost 2]# python p2_hrrest.py
Your age is:16
Your HRrest is:71
Your gender is:famale
Your suit HRrest is between  144.8 ~ 169.4

總結：

1. 這個例子將Int,float,str三種類型都用上了；
2. 在條件判斷里面加上了字符串比較gender=="male"。