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# 01-21 - Page 1 of 3 CIS 252 Introduction to Computer...

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CIS 252: Introduction to Computer Science Some key points from the January 21 class Annoucements - make up labs on Friday in CST 1-214, 3:30 to 5:00 Handouts - ``How to solve it'' (http://www.cis.syr.edu/courses/cis252/writeups/how-to.pdf) ==================================================================== George Polya - important, active mathematician working in complex analysis, math physics, probability, geometry, combinatorics, ... - math education (problem solving) ==================================================================== PROBLEM 1: Alice starts out at point P, goes due south for 1 mile, then due east for 1 mile, then due north for 1 mile, and ends up back at point P. Q: Where is Alice? Draw the picture! P P | | A--B ONE ANSWER: P = north pole ANOTHER ANSWER: A = B is on a near polar lattitude line. Walking one mile east takes you on a trip n-times around the pole. ==================================================================== PROBLEM 2: We have a 4 liter measure and a 9 liter measure and we want to measure out 6 liters. How? UNKNOWN (what are we required to do?) Get 6 lts of water (in the 9 lt measure) [Picture] DATA: the 4 lt and 9 lt measures CONDITION: can only use these two measures RELATED PROBLEM: measure out 5 liters (easy--how?) RELATED PROBLEM: measure out 1 liter (how?)

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