1. Computer Science 2
Arrays of Records

2. First Record Program
Input an unknown number of Team Names, School names, and Total scores. (While loop)
Output: The winning team. That is the team with the highest score. (If there is a tie, just show the first team with the top score.)
(Note, you don’t need an array for this program.)
Push: Same input as above, and show the schools with the top five scores. (You do need an array and a sort for this one.)

3. Goals
Review making records
Figure out how to make an array of records

4. Record Review Error Potential Error:Putting a ; here
Program RecordsExample;
type
StudType = record
name:string;
age:integer;
gpa:real;
end;
var
Student1,Student2:Studtype;
begin
writeln(‘Please enter your name’);
readln(Student1.name);
writeln(‘Please enter your age’);
readln(Student1.age);
writeln(‘Please enter another name’);
readln(Student2.name);
writeln(‘Please enter another age’);
readln(Student2.age);
if (Student1.age) > (Student2.age) then
writeln(Student1.name,’ is older’)
else
writeln(Student1.name, ‘ is not older ‘);
Writeln(Student1);
end.
Record Review
Potential Error:Putting a ; here
Potential Error:Forgetting the ‘end.’
Error

5. How would you… Store a large group of records? How can you set it up?
How can you access it?
How can you search it?

6. Array of Records Sample
Draw a picture for the variables in this program.
program arrayofrecsample;
type
rectype = record
name:string;
age:integer;
end;
arrayType = array[1..10] of rectype;
var
names:arrayType;
temp:rectype;
count, count2:integer;

7. Record how this code changes the variable.
More of the sample
Record how this code changes the variable.
begin
names[1].name:='Fred';
names[1].age := 72;
Writeln('Please enter a name');
readln(names[2].name);
writeln('Please enter their age');
readln(names[2].age);
temp.name:='Betty';
temp.age := 29;
names[3]:= temp;

8. You select the info to enter for the readlns.
Using a for do loop
You select the info to enter for the readlns.
for count := 4 to 6 do
begin
writeln('Please enter your name');
readln(names[count].name);
writeln('Please enter the age');
readln(names[count].age);
End;

9. What about an unknown number (within limits)?
count :=0;
writeln('Please enter a name or ZZZ to quit');
readln(temp.name);
while (temp.name <> 'ZZZ')and (count <10) do
begin
inc(count);//Same as count:=count+1;
writeln('Please enter the age');
readln(temp.age);
names[count]:= temp; // Copies the entire record
end;

10. Showing the data from a for loop
writeln('Name':10, 'Age':10);
for count2:= 1 to count do
begin
writeln(names[count2].name:10, names[count2].age:10);
end;
//Or
with names[count2] do
writeln(name:10, age:10);
end.

11. Write the declarations
Store 5 Names, their school, and extra curricular activity.
Use the record you declared at the beginning of class.

12. Dry Run!! program Wrecko; type rectype = record a:integer; b:real;
end;
arraytype = array[1..3] of rectype;
var
data: arraytype;
count,x,y:integer;
begin
for count := 1 to 3 do
data[count].a:= count;
data[count].b:= count *3;
for count:= 1 to 3 do
data[count].b:= data[count].b +data[count].a;
for count:= 3 downto 1 do
writeln(data[count].a:5, data[count].b:5:2);
for count:= 1 to 2 do
begin
data[count].a := data[count+1] .a;
data[count+1].b:=data[count].b;
end;
for count:= 1 to 3 do
writeln(data[count].a,data[count].b:5:2)
end.

13. Program Get 5 Names, schools, Extra Curricular activity Pushes:
Show all the information in a chart. (Name, School, Activity)
Let the user enter a name and the program will return their school and extra curricular activity.
Modify this to be set up as a menu. (Show all, Find person, Find School’s people (Show a list of all students from the school)
Pushes:
Improve user friendliness of the program.
Include an ‘Add another person’ option to the menu.
Calculate how many of people there are from each school.
Let it support holding an unknown number of records (but less than 100)
Write the program using procedures.
Add a menu item to sort the information by name.