Algorithms and Programs- Control Structures

Algorithms and Programs- Control Structures

Ms. Blake

Multiple Choice

Which of the following is not a type of algorithm?

• Pseudocode

• Flowchart

• IPO Chart

• Narrative (structured english)

Multiple Select

This datatype allows a variable to store either TRUE or FALSE

• Character

• Boolean

• String

• IPO chart

What are control structures in algorithms and programs?

Also refered to as PROGRAMMING CONSTRUCTS.

Control Structures tell how the instructions you write should be executed or processed.

They determine how the steps in your algorithm or program should flow.

Types of Control Structures

• Sequential

• Selection (conditional)

• Iteration (Repetition / loop)

Control Structures

• Sequential- the instructions are processed (executed) in the order they are written.

• Selection- makes a decision between one or more options.

• Iteration- repeat a set of instructions for a number of times.

Multiple Choice

Which of the following is NOT a control structure?

• Datatype

• Sequential

• Conditional

• Repetition

Multiple Choice

This control structure executes instructions in the order they are written.

• Iteration

• Selection

• Sequential

Sequential Control Structure Example (Narrative)

1.Ask user to enter 3 numbers

2.Computer accepts numbers

3.Find the sum of the 3 numbers

4.Divide the sum by 3

5.Print Answer

Using Selection/ conditional control structure example (Narrative)

• Ask user to enter 3 numbers

• Computer accepts numbers

• Find the sum of the numbers and store it in the variable total

• If total is greater than 40 then display “very good” ELSE

  Display “too bad”

Iteration/ Repetition Control structure Example (Narrative)

Set X to start at 1; (X = 1)

Repeat the instructions:

1. Ask user to enter 3 numbers

2.Computer accepts numbers

3.Find the sum of the 3 numbers

4.Divide the sum by 3

5.Print Answer

6.Add 1 to X

Until X becomes 20

Multiple Select

if age1 > age2 then

print "age 1 is bigger"

else

print "age2 is bigger"

This is an example of which construct?

• Iteration

• Repetition

• Conditional

Multiple Select

X= 1

Repeat

Print "enter name"

Read name

Print "your name is", name

X= X+1

Until X= 10

This is an example of which construct?

• loop

• Conditional

• Selection

Multiple Choice

Which of the following is NOT a control structure?

• Algorithms

• Conditional

• Repetition

• Sequential