What is the differ from a if structure and a case structure?

Answer 1

An if structure statement is an example of a single control structure statement. It utilized the use of a single comparison criteria to direct the flow of a program.

I.e. - If the ball is yellow then throw it.

An if-then-else statement is an example of a dual control statement. It is utilized when the use of one comparison criteria is needed but when there are two different resulting actions that are needed

.

I.e. - If the ball is yellow then throw it, else bounce it.

A case structure is typically utilized when 3 or more comparison criteria are needed. Here a case is established for each comparison and within the case is the directions that must be followed based on the comparison criteria for the case being true.

I.e. - If the ball is yellow then throw it.

If the ball is green then hold it.

If the ball is blue then bounce it.

This a simplified explaination.

Answer 2

An if structure evaluates a single condition and executes a block of code if that condition is true. A case structure evaluates a variable against multiple possible values and executes specific blocks of code based on the value of the variable. Case structures are often used when there are multiple conditions to check against, whereas if structures are used for simpler conditional logic.