Programming Logic and Design

Question

1. What is Decision control structure?

2. Create your own sample pseudocode implementing decision structure.

3. What is Function?

4. Create your own sample pseudocode implementing function.

Answer 1

1) Decision control structure, a.k.a. SELECTION statement

executes a block of code if the condition is true....

otherwise executes the alternative block of code

there is also a Selection structure

Select/switch (var)

case value1,value2,value3:

statements

case value A,value B, value C:

statements

endSelect

2)

Ex.

Integer x=0

(inputs integer between 1 and 10)

while (x<1) or (x>10)

output "Please input the number :>"

input x

endwhile

select/switch (x)

case 1,2,3:

output ("LOW");

case 4,5,6:

output("MEDIUM");

case 7,8,9:

output("HIGH");

case 10:

output("WOW!");

other: (<--- should not happen )

output("Huh?");

end select/switch

3)

A Function is a type of Module that can accept

one or more input parameters and returns a single

value to the caller

4)

double function Add( double num1, double num2)

{

return(num1+num2);

}

double function Subtract( double num1, double num2)

{

return(num1-num2);

}

double function Multiply( double num1, double num2)

{

return(num1*num2);

}

double function Divide( double num1, double num2)

{

if (num2 not zero)

{

return(num1/num2);

}

}