What if we want to perform more than one instruction if an expression evaluates to true (or false)?  

If

True

False
Kettle has boiled Put coffee in mug Come back later
Pour boiled water into mug
Stir
Drink

If we want to perform more than one instruction after an if or else statement, then we group the instructions we want to perform within curly brackets ‘{‘, ‘}’   So that the compiler knows all the instructions need to be carried out.   It looks like this:

if( expression )
{
   First Instruction
   Second Instruction
   etc..
}
else
{
   First instruction
   Second instruction
etc..
}

Even if we only want one instruction carried out we can still group it in curly brackets…

if( expression )
{
   Only Instruction
}

…But if we have more than one instruction we must use them:

if( expression)
 
   First Instruction
 
   Second Instruction
 This instruction will be carried out regardless of whether the expression evaluated to true or false, because we didn't use curly brackets.

This task is similar to the previous task, with the frog starting on either the left or right of the screen.   However in order to get the frog home, we will have to perform more than one instruction after we have found which side it started on.   First we test if the frog’s position is equal to zero, and that will tell us which side it is starting on.   Then we perform a number of instructions depending on how the expression evaluates

if( frogX() == 0 )
{
   frogDown(4);
   frogRight(8);
   frogUp(4);
}
 else
{
   etc.
}

Tasks: