Lecture 4

Library functions: SQRT, SIN, COS, ABS, IABS, IFIX, FLOAT - look for one for random numbers

FORTRAN identifiers were (and thus should be) limited to 6 characters

Test to see what happens if your output format is inadequate or too large *****

DO loop - original FORTRAN was always executed at least once --- in FORTRAN 77, it tested the starting value against the ending value

Exits when current value of loop control variable is greater than ending value

Arrays in standard FORTRAN has 1 as the lowest subscript

Order of operations (highest precedence to lowest) is

Library functions

** exponentiation

* /

+ -

Having parentheses can change order of operations

Results of integer division

Don’t use if (condition) …. End if or any else statements -- added in FORTRAN 77

Author’s slides for Chapter 3 (relates to handout from class which is to be discussed next time)

Student code examples

factorial

fibonacci

guessingGame

textPlay

In-Class Professor examples

myChar - does what textPlay wanted to do

myChar1v2 - shows that can’t hold more than 4 characters in a word

myChar1v3 - adds lines to myChar1v2 to read individual characters

myFormat - shows problems that can occur with output FORMAT statements

m1 – shows 3 ways of reading in 10 integers into an array - shows implied DO loop

source7 – shows use of FLOAT function to force real division to occur and then assigns real result to an integer

There may have been other short in-class examples but what they illustrate is covered in one of the above examples.