CMP 131 Introduction to Computer Programming

1
CMP 131Introduction to Computer Programming

• Violetta Cavalli-Sforza
• Week 4, Lab

2
Brief Review

• Expressions
• Pascal Data Types
• Real
• Ordinal Data Types
• Integer
• Character
• Boolean

3
Integer Data Type

• A type Integer object represent only whole
  numbers.
• Not all integer range can be represented inside a
  computer.
• On each system, the predefined constant MaxInt is
  the largest possible integer. The smallest
  integer is -MaxInt-1
• Objects
• Variables
• Constants
• Literals
• Operations
• Arithmetic - / div mod
• div computes the integral part of the result of
  dividing the first operand by the second.
• mod returns the integer remainder of the result
  of dividing its first operand by its second.
• Assignment
• Standard procedures
• ReadLn, WriteLn, Read, Write

4
What is MaxInt?
PROGRAM MaximumInteger BEGIN writeln('MaxInt
', MaxInt) END.
OUTPUTS MaxInt 32767
5
Division
PROGRAM Division VAR resint, dividend,
divisor integer resreal real BEGIN
dividend 13 divisor 4 resreal
dividend / divisor resint dividend DIV
divisor write('resreal ', resreal52)
write(' resint , resint) writeln(' mod
', dividend MOD divisor) readln END.
OUTPUTS resreal 3.25 resint 3 mod 1