1. Program options Write a program for one of the following
Volume and surface area of cylinder (YourNameCylinder)
Input: The radius and height of a cylinder.
Process:
Surface area = πr2 + πr2 +2 πrh
Volume = πr2h
Output: The Volume and surface area of the cylinder.
Write a program to calculate the volume of a spherical cap. Include the needed inputs. (YourNameSphere)
a = radius of the cap
r = radius of the sphere
h = height of the cap

2. Write a second program for one of the following

3. Computer Science 1
If..then..else

4. Learning Objectives Understand the semantics and syntax of if then
Be able to read a program that has if .. Then
Be able to write a program that uses if..then.

5. How do you. Congratulate someone if they have done a great job
How do you.. Congratulate someone if they have done a great job? Check to see if three sides make a triangle? Check if an equation has real roots?

6. If..then..else When Semantics
If it makes sense to say ‘if’, it probably makes sense to use if
If you want to check to make sure you have a triangle before finding its’ area
Check to make sure you have real roots before using the quadratic equation
If you want to password protect your program.
Semantics

7. Note the missing semicolon!
Syntax: If..Then
If (condition) then
Begin
{Commands to do when the condition is TRUE}
end;
//or
SingleStatement;
Note the missing semicolon!
Program IfThenSample;
Var
Testscore:integer;
Begin
Writeln(‘Please enter a test score’);
Readln(testscore);
If (testscore>95) then
Writeln(‘Congratulations’);
Writeln(‘Keep up the good work’);
End;
End.
Note the indenting

8. Conditions: Boolean Idea Symbol Example Less than <
If (score <20) then
Greater than
>
If (score > 95) then
Less than or equal to
<=
If (score <= 50) then
Greater than or equal to
>=
If (score >= 94) then
Equal to =
If (name = ‘Wilma’) then
Not equal to
<>
If (answer <> password) then
Order of ops ()
If ((score + 8) < total) then

9. AND OR NOT AND OR NOT Connects two conditions
The statement is true iff both conditions are true.
If ((age >= 13) and (age<20)) then
begin
writeln(‘You are a teenager’);
end; OR
The statement is true if either one or the other or both conditions are true
If ((name = ‘Smith’) OR (class = ‘CS1’)) then
Writeln(‘You’’re in the correct class’);
NOT
Changes true to false and false to true
If NOT (score<90) then
Writeln(‘You have an A ‘);

10. Looking at the condition: True or False
For this example assume the following
a:= 4; b:= 6; c:= 3; d:= 5.2;
(5<4)
(12>6) and(3<2)
NOT ((8>7) OR (6<>3))
((a>c) and (d<b)) OR (6>=b)
What condition would you use to determine if the temperature (t) is in the 90s?
(temp

11. NO SEMICOLON BEFORE THE ELSE!!!
Syntax: If..Then..Else
If (condition) then
Begin
{Commands to do when the condition is TRUE}
end
else
begin
{Commands to do in the condition is FALSE}
end;
NO SEMICOLON BEFORE THE ELSE!!!

12. Dry Run Write the names for the variables Write Screen
Step through the program and change the variables/screen based on the commands.

13. Fix the following This program is on the website as Fix9-20.pas
Load it and save it to your folder before fixing.

14. Program options. Input: A test score.
Output: A congratulations if the score is above 90. Push: Add comments for scores 80-90, 70 – 80 , 60 – 70 etc…
Input: The lengths for three sides of a triangle.
Output: Whether or not the three sides make a triangle.
Push: Calculate the area of this triangle.
Push: Determine if it is a right triangle.
Input: Three scores.
Output the three scores in order lowest to highest.