CMSI 182 -  Introduction to Computer Science

Week 5

Schedule

References

Biermann's class notes:

Review of Some Features of Pascal

To concatenate two strings s1 and s2 and produce a third string s3

s3 := s1 + s2;

To extract a substring s1 from a string s2

s1 := copy(s2, startingPosition, numberOfCharactersToExtract);

To find the length n of a string s1

n := length(s1);

To find the position p of a string s1 inside string s2

p := pos(s1, s2);  { p = 0 if s1 not in s2 }

To format the output of a real number x

writeln(x : 10:2);  { outputs value of x in a field 10 columns wide with 2 digits to the right of the decimal point.  e.g. bbbbb12.34  where b = blank }

To declare an array

type
    myStringArrayType = array[1..100] of string;
var
    s : myStringArrayType;  { creates an array of 100 variables called s[1], s[2], ..., s[100].  Each variable is of type string. }

To define a subroutine

procedure myProc(var x, y : real; var i : integer);
var
    j, k : integer;  { internal variables }
begin
...
end;

To call a subroutine

myProc(w, 1.5, 8);  { calls procedure myProc which has three parameters }

Homework

Read

Chapter 4

Reminder

Homework #4 is due next Tuesday.

Ken Geddes Home Page | CMSI 182 Index | Week 4 | Week 6
Last Modified February 10, 2000
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