QUESTION 13 · Selection
Use an else-if ladder for ranges or conditions involving different expressions.
QUESTION 14 · Selection
Both forms choose among alternatives, but they test conditions in different ways.
Each branch can test a different condition. Conditions may use relational and logical operators, such as marks >= 90 or age >= 18 && has_id. Conditions are checked in order until one is true. Only that branch executes. A final else can handle the remaining cases.
One integer expression is compared with integer constant case values. This makes numbered menus or character-based operation choices clear. A default label handles a missing match. Case labels do not stop execution; a break or another transfer is normally used to prevent unwanted fall-through.
Choose the form that expresses the actual condition clearly. An else-if ladder may perform up to k tests for k conditions. A switch is not guaranteed by C to be faster: the compiler chooses an implementation. For a small fixed decision, both may involve only constant work. Correct logic and readability matter more than assuming one keyword always improves speed.
| Feature | Else-if ladder | switch |
|---|---|---|
| Condition | Separate conditions, including ranges | One integer expression and constant case values |
| Branch control | First true branch only | Starts at matching label; may fall through |
| Remaining cases | Final else | default label |
| Typical use | Grades, eligibility ranges | Menus, operator choices |
Related questions in the selection category from the supplied papers. The marks below are the printed allocations, including any combined subquestion.
Discuss decision-making statements with an example.
Paper P02 · page 1Illustrate forms of if statements with syntax and examples.
Paper P03 · page 1