Difference between revisions of "CSC231 Powers of 2 in Python"
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* First do the exercise with C++ mentioned above. | * First do the exercise with C++ mentioned above. | ||
* Then create the program below, and run it. It will wait you to press Enter at every loop, so that you can control the speed of the loop. | * Then create the program below, and run it. It will wait you to press Enter at every loop, so that you can control the speed of the loop. | ||
* What happens when you reach 2147483648, and press Enter a few times? How is that different from the C++ approach? Why? | * What happens when you reach 2147483648, and press Enter a few times? How is that different from the C++ approach? Why? | ||
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==The Program== | ==The Program== | ||
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# mulby2.py | # mulby2.py | ||
# D. Thiebaut | # D. Thiebaut | ||
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break | break | ||
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Latest revision as of 12:18, 13 November 2014
--D. Thiebaut 13:57, 8 October 2010 (UTC)
This Exercise is a companion to the same exercise implemented in C++.
Exercise: Powers of 2 in Python...
- First do the exercise with C++ mentioned above.
- Then create the program below, and run it. It will wait you to press Enter at every loop, so that you can control the speed of the loop.
- What happens when you reach 2147483648, and press Enter a few times? How is that different from the C++ approach? Why?
The Program
# mulby2.py
# D. Thiebaut
# csc231
# demonstrates how python changes type of
# variable as computation progresses. Compare
# this to how a compiled language would react in this
# situation (mulby2.cpp)
x = 0x1
print "starting value of x = ", x
#curType = type( x )
#print "type( x ) = ", type( x )
while ( True ):
lastx = x
x = x * 2
print "x = ", x
raw_input( "> " )
continue
if type( x )!= type( lastx ):
print "last x = ", lastx
print "type( last x ) = ", type( lastx )
print "x = ", x
print "type( x ) = ", type(x)
break
