python习题练习(五)

参考书籍:python程序设计

chapter7

5.

#This pro print the healthy level based on the BMI.
#input:weight(kg), and height(cm).
#output:healthy level

def ConvertWeight(weight):
    #This pro convert weight kg to bounds.
    return 2.2046 * weight

def ConvertHeight(height):
    #This pro convert height cm to inch
    return 0.3937 * height

def main():
    weight = float(input("Enter your weight(kg):"))
    height = float(input("Enter your height(cm):"))
    #convert weight and height
    weight = ConvertWeight(weight)
    height = ConvertHeight(height)
    #cal the bmi
    BMI = 720 * weight / height ** 2
    #healthy level
    if BMI < 19:
        level = "up"
    elif BMI <= 25:
        level = "in"
    else:
        level = "down"
    #print
    print("your healthy level is {0} the healthy area.".format(level))

main()

11.

#This pro judges whether the year is leap year.
#input: year number
#output: leap year or not

def main():
    year = int(input("Enter the year number:"))
    if year % 100 == 0:
        if year % 400 == 0:
            whether = "is"
        else:
            whether = "is not"
    elif year % 4 == 0:
        whether = "is"
    else:
        whether = "is not"
    print("year {0} {1} leap year.".format(year, whether))

main()

12.

#This pro vertify the date is valid.
#input:date in format month/day/year
#output:whether valid or not

def WhetherLeap(year):
    if year % 100 == 0:
        if year % 400 == 0:
            return True
        else:
            return False
    elif year % 4 == 0:
        return True
    else:
        return False

def main():
    month, day, year = input("Enter the date like month/day/year:").split('/')
    month = int(month)
    day = int(day)
    year = int(year)
    if month in [1, 3, 5, 7, 9, 10, 12]:
        if 1 <= day <= 31:
            flag = "valid"
        else:
            flag = "not valid"
    elif month in [4, 6, 9, 11]:
        if 1 <= day <= 30:
            flag = "valid"
        else:
            flag = "not valid"
    elif month == 2:
        if WhetherLeap(year):
            if 1 <= day <= 29:
                flag = "valid"
            else:
                flag = "not valid"
        else:
            if 1 <= day <= 28:
                flag = "valid"
            else:
                flag = "not valid"
    else:
        flag = "not valid"
    print("The date is {0}.".format(flag))

main()

13.

#This pro count the days in a year.
#input:date in format month/day/year
#output:days counter

def WhetherLeap(year):
    if year % 100 == 0:
        if year % 400 == 0:
            return True
        else:
            return False
    elif year % 4 == 0:
        return True

def WhetherValid(month, day, year):
    if month in [1, 3, 5, 7, 9, 10, 12]:
        if 1 <= day <= 31:
            return True
        else:
            return False
    elif month in [4, 6, 9, 11]:
        if 1 <= day <= 30:
            return True
        else:
            return False
    elif month == 2:
        if WhetherLeap(year):
            if 1 <= day <= 29:
                return True
            else:
                return False
        else:
            if 1 <= day <= 28:
                return True
            else:
                return False
    else:
        return False

def main():
    month, day, year = input("Enter the date like month/day/year:").split('/')
    month = int(month)
    day = int(day)
    year = int(year)
    if WhetherValid(month, day, year):
        if month <= 2:
            dayNum = 31 * (month - 1) + day
        else: #month > 2
            if WhetherLeap(year):
                dayNum = 31 * (month - 1) + day - (4 * month + 23) // 10 + 1
            else: #not a leap year
                dayNum = 31 * (month - 1) + day - (4 * month + 23) // 10
    print("day num is: ", dayNum)

if __name__ == "__main__":
    main()

17.

#This pro move the circle to the click zone 10 times.

from graphics import *

def drawCircle(center, size):
    myCircle = Circle(center, size)
    myCircle.setOutline('black')
    myCircle.setWidth(1)
    return myCircle

def drawWin(dx, dy, ux, uy):
    win = GraphWin("Moving", 400, 400)
    win.setBackground('white')
    win.setCoords(dx, dy, ux, uy)
    return win

def main():
    #draw the win
    weight = 100
    height = 100
    win = drawWin(0, 0, weight, height)
    #draw the circle
    center = Point(50, 50)
    size = 10
    circle = drawCircle(center, size)
    circle.draw(win)
    #move the circle
    dx, dy = 1, 1
    for i in range(200):
        circle.move(dx, dy)
        poin = circle.getCenter()
        #about x
        if poin.getX() + size > weight:
            dx = -1
        elif poin.getX() - size < 0:
            dx = 1
        #about y
        if poin.getY() + size > height:
            dy = -1
        elif poin.getY() - size < 0:
            dy = 1
        #update
        update(30) #pause so rate is not more than 30 times a second.
    #click to quit
    print("Click to quit.")
    win.getMouse()
    win.close()

if __name__ == "__main__":
    main()