Question

CSC 130 Lab Assignment 8 – Program Menu Create a C source code file named lab8.c that implements the following features. Implement this program in stages using stepwise refinement to ensure that it will compile and run as you go. This makes it much easier to debug and understand. This program presents the user a menu of operations that it can perform. The choices are listed and a prompt waits for the user to select a choice by entering a number. This kind of menu is a common feature of command-line programs. It can be implemented to execute in the main() function or it can be implemented in a function known as the commandchooser function that returns a numeric value for a choice that can be passed to another function known as the command-dispatcher. 1. Define symbolic constants for FALSE and TRUE 2. Define an int main() function • int done = FALSE; is a flag defined inside int main and used to determine if the user has finished using the program or not. 3. while-loop not done • Loop while the done flag is equal to false /* command chooser */ 4. Implement printf() statements which list menu choices • The first part of the command chooser prints a menu that lists choices for the user. Each choice is a string that begins with the value to be entered on the keyboard to make the choice and ends with a brief description of an operation. • Example: “3 - Operation 3” 5. Next, implement a do-while loop with the result of the scanf() function part of the while condition. • scanf()returns an integer whenever it is called usually this value is not important, but for the command chooser it is essential. • If an improper value was input, scanf() will return a value less than 1. This allows us to create a do-while loop which validates the users input. • See Formatted I/O lecture slides for an example 6. Once implemented, place the printf() statements from step 4 into the do-while loop body. /* command dispatcher */ 7. Implement if else logic where each logical branch corresponds to a menu choice. 8. One choice must set done TRUE. • The command choice to exit the program sets the done flag to TRUE • HINT: This implies one of the menu choices must be to quit the application. If the quit choice was chosen, setting the done flag to TRUE prevents any further action from being taken. 9. All other choices are program operations • All other command choices perform an operation either inline or by calling a function with or without arguments. • For this lab, all command choices should simply printout which operation was selected. No external methods need to be called. 10. Default case prints invalid choice message • The scanf() logic cannot stop all invalid choices, but an else statement of the if else logic can catch the others and print a message. 11. After executing the users chosen command, the while-loop will then continue prompting the user to select an operation or to quit. 12. At the end of the while-loop print “Goodbye” to the console Once completed, please submit lab8.c to Blackboard. An example of this programs expected output is attached below. 1 - Operation 1 2 - Operation 2 3 - Operation 3 4 - Operation 4 5 - Quit 3 //user inputted value Doing operation 3 1 - Operation 1 2 - Operation 2 3 - Operation 3 4 - Operation 4 5 - Quit 1 //user inputted value Doing operation 1 1 - Operation 1 2 - Operation 2 3 - Operation 3 4 - Operation 4 5 - Quit 5 //user inputted value Goodbye

Answer 1

Please find the program below:

lab8.c

#include<stdio.h>
#include<conio.h>

const int FALSE = 0;
const int TRUE = 1;

int main() {
   int done = FALSE; // Setting done to false as user is not done entering choice yet
   int ch;
   while(!done) { // Looping until not done
       do {
           // Printing the Menu of choices (command chooser)
           printf("1 - Operation 1\n");
           printf("2 - Operation 2\n");
           printf("3 - Operation 3\n");
           printf("4 - Operation 4\n");
           printf("5 - Quit\n");
           printf("Enter your choice: ");
       } while(scanf("%d", &ch) < 1); // Checking if the input choice is valid
       // Printing the corresponding choive chose by the user (command dispatcher)
       if (ch == 1) {
           printf("Operation 1 is Selected\n");
       } else if (ch == 2) {
           printf("Operation 2 is Selected\n");
       } else if (ch == 3) {
           printf("Operation 3 is Selected\n");
       } else if (ch == 4) {
           printf("Operation 4 is Selected\n");
       } else if (ch == 5) {
           done = TRUE; // Quitting the program
           break;
       } else {
           printf("Invalid choice\n");
       }
   }
   printf("Good Bye...");
   return 1;
}

Sample Output: