On 12/22/2012 05:38 PM, Farrukh Ali wrote: > Hi, i am using ActivePython 2.7.2.5, and windows 8 professional. > well the original ex3.py is: > print "I will now count my chickens:" > print "Hens", 25 + 30 / 6 > print "Roosters", 100 - 25 * 3 % 4 > print "Now I will count the eggs:" > print 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6 > print "Is it true that 3 + 2 < 5 - 7?" > print 3 + 2 < 5 - 7 > print "What is 3 + 2?", 3 + 2 > print "What is 5 - 7?", 5 - 7 > print "Oh, that's why it's False." > print "How about some more." > print "Is it greater?", 5 > -2 > print "Is it greater or equal?", 5 >= -2 > print "Is it less or equal?", 5 <= -2 > > And i have made ex3.py this way below > > print "I will now count my chickens:" > print "Hens",25+30.0/6 > print "Roosters",100 - 25.0 * 3.0 % 4 > print "Now I will count the eggs:" > print 3+2+1-5.0+4.0%2-1/4.0+6 > print "Is it true that 3+2<5-7?" > print 3+2<5-7 > print "What is 3+2?",3+2 > print "What is 5-7?",5-7 > print "Oh, that's why it's False." > print "How about some more." > print "Is it greater?", 5>-2 > print "Is it greater or equal?", 5>=-2 > print "Is it less or equal?", 5<=-2 > > > The author has given us extra credit to practice so here it is and the > 5th point below, which i was asking. > > Extra Credit > 1. Above each line, use the # to write a comment to yourself > explaining what the line does. > 2. Remember in Exercise 0 when you started python? Start python this > way again and using the above characters > and what you know, use python as a calculator. > 3. Find something you need to calculate and write a new .py file that > does it. > 4. Notice the math seems "wrong"? There are no fractions, only whole > numbers. Find out why by researching > what a "floating point" number is. > 5. Rewrite ex3.py to use floating point numbers so it's more accurate > (hint: 20.0 is floating point).
OK, so his point #4 is that for eggs, 1/4 gives a zero, not a 0.25. So you lose accuracy in that sense. So point #5 is to allow fractions to propagate. Note that in Python 3.x, 1/4 will already give a float, rather than an int, and if you want the 2.x behavior, you would write it as 1//4 Otherwise, it looks right to me. -- DaveA _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
