python 核心编程课后练习(chapter 5)
5-2
1 #5-2 2 def mul(x, y): 3 return x * y 4 5 print mul(4,5)
5-3
1 #5-3 2 def value_score(num): 3 if 90<=num<=100: 4 return 'A' 5 elif 80<=num<=89: 6 return 'B' 7 elif 70<=num<=79: 8 return 'C' 9 elif 60<=num<=69: 10 return 'D' 11 elif 0<=num<=59: 12 return 'F' 13 else: 14 print "invalid value" 15 16 print value_score(90) 17 print value_score(1000) 18 print value_score(0)
5-4
1 #5-4 2 def Leap_year(year): 3 if year%4 == 0 and year%100 == 0 : 4 return True 5 elif year%4 == 0 and year%100 != 0 : 6 return True 7 else: 8 return False 9 10 if Leap_year(2004): 11 print "leap year" 12 else: 13 print "common year"
5-5
1 #5-5 2 import random 3 4 def least_cents(cts): 5 left = 0 6 sum = 0 7 #get the coins of 25cents 8 sum = cts/25 9 left = cts%25 10 #get the coins of 10cents 11 sum += left/10 12 left = left%10 13 #get the coins of 5cents 14 sum += left/5 15 left = left%5 16 #get the coins of 1cents 17 sum += left 18 19 return sum 20 21 cents = random.randint(1, 100) 22 23 print "%d cents will have at least: %d coins" % (cents, least_cents(cents))
5-6
1 #5-6 2 3 def add(x, y): 4 return x + y 5 6 def sub(x, y): 7 return x - y 8 9 def mul(x, y): 10 return x * y 11 12 def div(x, y): 13 return float(x)/float(y) 14 15 def mod(x, y): 16 return x % y 17 18 def pow(x, y): 19 return x ** y 20 21 def cal(str): 22 a = [] 23 if(len(str.split('**')) == 2): 24 a = str.split('**') 25 return pow(int(a[0]), int(a[1])) 26 elif (len(str.split('*')) == 2): 27 a = str.split('*') 28 return mul(int(a[0]), int(a[1])) 29 elif (len(str.split('%')) == 2): 30 a = str.split('%') 31 return mod(int(a[0]), int(a[1])) 32 elif (len(str.split('+')) == 2): 33 a = str.split('+') 34 return add(int(a[0]), int(a[1])) 35 elif (len(str.split('-')) == 2): 36 a = str.split('-') 37 return sub(int(a[0]), int(a[1])) 38 else: 39 print "Not support" 40 41 42 print "enter the formula:" 43 formula_str = raw_input() 44 print cal(formula_str)
5-7
1 #5-7 2 def tax(num): 3 return num * 0.03 4 5 turnover = raw_input("enter the turnover:") 6 print"the tax you need to turn over to the state: %f" %(tax(int(turnover)))
5-8
1 #5-8 2 import math 3 def suqare_area(len): 4 return float(len) * float(len) 5 6 def suqare_volume(len): 7 return float(len) ** 3 8 9 def circle_area(r): 10 return math.pi * float(r) * float(r) 11 12 def spere_volum(r): 13 return 4 * math.pi * float(r) * float(r) * float(r)/ 3.0 14 15 16 len = raw_input("enter the len:") 17 18 print "the area of suqare is: %f" % suqare_area(len) 19 print "the volume of square is: %f" % suqare_volume(len) 20 21 r = raw_input("enter the r:") 22 print "the area of the circle is: %f" % circle_area(r) 23 print "the volume of spere is: %f" % spere_volum(r)
5-10
1 #5-10 2 def fah_to_centi(c): 3 return (c - 32)*(5/float(9)) 4 5 c = raw_input("enter the fahrenheit:") 6 7 print "the centi degrees is: %f" % fah_to_centi(float(c))
5-11
1 #5-11 2 def odd_num(num): 3 return num %2 == 1 4 5 def aliquant(n1, n2): 6 return n1 % n2 == 0 7 8 for e in range(0, 20): 9 if not odd_num(e): 10 print "even number:%d" % e 11 12 for e in range(0, 20): 13 if odd_num(e): 14 print "odd number: %d" % e 15 16 n1 = raw_input("enter the first number:") 17 n2 = raw_input("enter the second number:") 18 if aliquant(int(n1), int(n2)): 19 print"aliquant" 20 else: 21 print"not aliquant"
5-12
1 #5-12 2 import sys 3 4 print sys.maxint 5 print -sys.maxint - 1 6 7 print sys.float_info.max 8 print sys.float_info.min
5-13
1 #5-13 2 3 def hm_to_m(str): 4 a = str.split(':') 5 return int(a[0])* 60 + int(a[1]) 6 7 hm = raw_input("enter the time:") 8 9 print "the currents mins is: %d" % hm_to_m(hm)
5-14
1 #5-14 2 def year_rate(): 3 return (1+0.0385)** 365 - 1.0 4 5 print year_rate()
5-15
1 #5-15 2 def GCD(m,n): 3 if m%n == 0: 4 return n 5 else: 6 return GCD(n, m%n) 7 8 def LCM(m, n): 9 return m*n/GCD(m, n) 10 11 m = int(raw_input("enter m:")) 12 n = int(raw_input("enter n:")) 13 14 print"the GCD of %d, %d is: %d" % (m, n, GCD(m, n)) 15 print"the LCM of %d, %d is: %d" % (m, n, LCM(m, n))
5-17
1 #5-17 2 import random 3 4 N = random.randint(2, 100) 5 a = [] 6 7 def show_all(a): 8 for i in range(len(a)): 9 print a[i] 10 11 for i in range(0, N-1): 12 tmp = random.randint(2, 2**31) 13 a.append(tmp) 14 print "Original:" 15 show_all(a) 16 17 for i in range(0, N-1): 18 for j in range(i, N-1): 19 if a[i] > a[j]: 20 a[i], a[j] = a[j], a[i] 21 22 print"New arrary:" 23 show_all(a)
