What type of structure do you use in a program to perform the action that the user has selected from a menu?

In programming, control structures are used to manage the flow of the program. These include simple decision-making statements, such as if-else statements, which allow a program to choose between two or more actions based on certain conditions, and loops, which allow a program to repeat a certain action for a specific number of times or until a condition is met.

Decision-making statements are used when we need to make a choice between different actions based on one or more conditions. The most basic decision-making statement is the 'if' statement, which evaluates a condition and, if true, executes the code block following the 'if'. If the condition is false, we can use an 'else' statement to execute another block of code instead.

Menu-based programs usually present users with a list of options, and then use decision-making structures to execute the appropriate action based on the user's selection. For instance, a simple text-based menu could display numbered options, such as "1. Add", "2. Delete", and "3. Quit", and the user would input the corresponding number to perform the desired action.

One of the control structures that can be used to create menu-based programs is the switch-case statement. Switch-case statements are suitable for situations where the program needs to evaluate a single variable (e.g., the user's input) and choose between multiple actions based on the value of that variable. The switch-case structure includes a series of 'case' statements, each of which corresponds to a different action, and a 'default' statement that is executed if none of the cases match the value of the variable being evaluated.

To use a switch-case statement in a menu-based program, we would first ask the user to input their choice from the available menu options, then evaluate that input using the switch-case structure. For each menu option, we would define a 'case' statement that executes the corresponding action if the user's input matches the value associated with the case. If none of the cases match the user's input, the 'default' statement can be used to handle any unexpected input, such as showing an error message. In conclusion, the type of structure used in a program to perform the action that the user has selected from a menu is a switch-case statement. This control structure allows the program to efficiently handle multiple actions based on the user's choice.