Selection statements

So far have used a sequence of statements. Often we need to select between alternative actions.

Ada provides two types of selection statements:

• IF statements
  • if-then statements, for when a single action might be done
  • if-then-else statements, to decide between two possible actions
  • if-then-elsif statements, to decide between multiple actions
• case statements, also for deciding between multiple actions

Selection of alternatives is determined by working out whether a given condition is true.

Writing conditions and treir associated actions correctly can be tricky. Truth tables can help you make sure the conditions and associated actions are correct.