Class Crib Notes for CPSC 110 Brent Dingle

Friday, January 25, 2002

Reminders:

Homework and Quiz next week in lab.

Recall Algorithm Definition.

Recall Program Definition.

Card Trick:

Determine 2 unknown numbers via some ‘magic’

(2a + 5) * 5 + b – ???? reveals a and b.

Program Design to perform trick

Problem Solve phase

Prob definition

Find a and b using some math properties

Design phase

Write out algorithm

Test phase

Prove it will always work

Implementation phase

Code Algorithm

Write it out in Pascal

Discuss

PROGRAM, BEGIN, END = reserved words

program name = identifier

Variable = identifiers

Writeln, Readln = standard identifiers

Each line is a program statement

Assignment operator, :=

(assignment statement)

Variable types:

Ask for user name (String)

Ask for final number (integer)

Expressions

can be stuff on right side of :=

(math expressions)

Test code

Run it on random input data