Last class sections 3 4 3 6
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Last Class (sections 3.4 - 3.6) PowerPoint PPT Presentation


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Last Class (sections 3.4 - 3.6). What is a variable? rules for naming variables garbage values strings, chars, boolean rules for naming variables Integer Variables example from book +, -, *. Data Types: Reals. A number that contains a decimal point can begin with a ‘+’ or a ‘-’

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Last Class (sections 3.4 - 3.6)

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Last class sections 3 4 3 6

Last Class (sections 3.4 - 3.6)

  • What is a variable?

    • rules for naming variables

    • garbage values

    • strings, chars, boolean

    • rules for naming variables

  • Integer Variables

    • example from book

    • +, -, *


Data types reals

Data Types: Reals

  • A number that contains a decimal point

    • can begin with a ‘+’ or a ‘-’

    • must have digits on both sides of the decimal

    • cannot contain

      • commas

      • an embedded blank

      • non-numeric characters

      • a’+’ or a ‘-’ at the end of the value


Real operators

Real Operators

  • +, -

  • *, /

  • operator precedence

    • PEMDAS


Integer operators

Integer Operators

  • +, -

  • *

  • DIV“integer division”

  • MOD“remainder operator”

  • operator precedence


Mixed mode

Mixed mode

  • You can assign an integer value to a real variable. The compiler automatically converts the integer into a real (ie. 5 -> 5.0)

  • You cannot assign a real to an integer.

  • Mixed mode is when both integers and reals are on the right side of an expression (a real variable must be on the left side).


Section 3 11

Section 3.11

  • readln


Correcting syntax errors

Correcting syntax errors

  • Go over example in book


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