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Conditio nal Statemen t

Author: jordan-delacruz

Post on 23-Dec-2014

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Conditional Statement

Conditional Statements

•Are statements that check an expression then may or may not execute a statement or group of statement depending on the result of the condition.

TYPES

1.IF-THEN STATEMENT

2.IF-THEN-ELSE STATEMENT

IF-THEN STATEMENT

• It specifies that a certain statement will be executed only if the expression is true

SYNTAX

• IF condition THEN expression

Example

IF the telephone is ringing THENanswer the telephone

RELATIONAL OPERATIONS

1.=

2.>

3.<

4.>=

5.<=

SAMPLE PROBLEMS

•Write a program that will output “Congratulations!” if the student’s grade is greater than or equal 75.

Rem

Clear

Input G

IF G>=75 THEN Print “Congratulations!”

End

•Write a program that will ask for a price. If the price is greater than 1000, compute a 10% discount from the original price. Display the computed discount.

Clear

Input P

If P>1000 THEN d=P*.1

Print d

End

IF-THEN-ELSE Statement

•It allows the computer to choose one of the given two alternatives.

SYNTAX

•IF condition THEN expression1 ELSE expression2

SAMPLE PROBLEMS

•Write a program to print for the sum of two numbers if the first no. is greater than the second no., otherwise print their difference

REM

Clear

Input x,y

If x>y THEN S=x+y : Print S

ELSE

D=x-y : Print D

End

•Write a program that determines if the input age is qualified to vote or not. If qualified, displays “Qualified to Vote!” if not displays “Too Young!” We know that a qualifying age is 18 yrs. old and above.

REM

Clear

Input A

If A>=18 THEN Print “Qualified to vote!”

ELSE Print “Too Young!”

End

NESTED IF or LADDERIZED IF-THEN-ELSE Statement

•is used if there are three or more possible conditions and outcomes to be executed.

SYNTAX

IF condition1 THEN

Expression1

ELSE IF condition2 THEN

Expression N

ELSE

Expression

SAMPLE PROBLEMS

•Write a program that displays an equivalent color once an input letter matches its first character for example b is for blue, r for red and so on. Here is the given criteria.

Letters Colors“B” or “b” Blue“R” or “r” Red“G” or “g” Green“Y” or “y” Yellow

Other letters Unknown Color

REM

Clear

Input x

IF x=b THEN Print “Blue”

ELSE IF x=r THEN Print “Red”

ELSE IF x=g THEN Print “Green”

ELSE IF x=y THEN Print “Yellow”

ELSE Print “Unknown Color!”

ASSIGNMENT

1. Write a program to display the high school level of a student, based on its year entry number for example the year-entry 1 means the student is a freshmen, 2 for sophomore, and so on. Here are the given criteria:Year-Entry Number High School Level

1 Freshmen

2 Sophomore

3 Junior

4 Senior

Other Entry No. Out-of-School

Write a program that examine the value of a variable called temp. then display the following messages depending on the value assigned to the temp.

Temperature Message

Less than 0 ICE

Between 0 and 100 Water

Exceeds 100 STEAM

T. O. L.