Coding - practical 4

Question 1

What is the general form of a basic if statement?

Answer 1

if (condition)
{
          // do this code
}


Question 2

What happens if the condition in an if statement is true?

Answer 2

If the condition is true then the statements enclosed by braces are executed, and if the condition is false the statements are skipped.

Question 3

What are comparison operators?

Answer 3

Symbols that determine the relationship between two values:
> Greater than
< Less than 
>= Greater than or equal to 
<= Less than or equal to 
== Equal to (different to assignment =)
!= Not equal to

Question 4

What may comparison operators be used to construct?

Answer 4

A conditional expression

Question 5

What would the code be to display a warning if the temperature of a boiler exceeds 99 degrees centigrade.?

Answer 5

if (temp > 99)
{
std::cout &laquo_space;“Warning water is BOILING\n”;
}

Question 6

What is the general form of a basic if..else statement?

Answer 6

if(condition)
{
   //code block 1
}

else
{
  //code block 2
}

Question 7

What is the general form of a basic else if statement?

Answer 7

if(condition1)
{
    //code block 1
}

else if (condition2)
{
   //code block 2
}

else
{
   //code block 3
}

Question 8

Describe how an else if statement works.

Answer 8

If the outcome of condition 1 is true then code block 1 is executed. If the outcome of condition 1 is false then condition 2 is tested and if found to be true then code block 2 is executed, if both condition 1 and condition 2 are false then code block 3 is executed. Only one code block is executed.

Question 9

What are the two arguments within aservePlaySample()?

Answer 9

• The first argument specifies the sample channel to playback.
• The second argument is the volume to play the sample at, just like the oscillators it has a range from 0 to 1.0.

Question 10

What are nested if statements?

Answer 10

On occasions were a more complex decision making process is required, we can place if structures inside other if structures. This is called “nesting”