conditional statement ss1
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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
3.LADDERIZED 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.