Menu Selection Program

Introduction

This document provides a detailed explanation of the code that implements a simple menu selection program in C. The program allows users to select items from different categories (Pizza, Burger, Coffee) and calculates the total cost of the selected items.

Code Explanation

Includes

#include <stdio.h>

• The program includes the standard input-output library to handle user inputs and outputs.

Main Function

int main()
{
   int in = 0;
   int total_cost = 0;

   while (in != 4)
   {
      printf("Category :\n 1.Pizza \n 2.Burger \n 3.Coffee \n 4.Exit \n");
      scanf("%d", &in);

      if (in == 1)
      {
         printf("Items :\n 1.Cheese Fountain -235 tk \n 2.Meaty Onion -240tk \n 3.Tender Beef -400tk \n");
         scanf("%d", &in);

         switch (in)
         {
         case 1:
            printf("Cheese Fountain served\n");
            total_cost += 235;
            break;
         case 2:
            printf("Meaty Onion served\n");
            total_cost += 240;
            break;
         case 3:
            printf("Tender Beef served\n");
            total_cost += 400;
            break;
         }
      }
      else if (in == 2)
      {
         printf("Items :\n 1.Juicy BOMB -175tk \n 2.BBQ -200tk \n");
         scanf("%d", &in);

         switch (in)
         {
         case 1:
            printf("Juicy BOMB served\n");
            total_cost += 175;
            break;
         case 2:
            printf("BBQ served\n");
            total_cost += 200;
            break;
         }
      }
      else if (in == 3)
      {
         printf("Items :\n 1.Special Hot Coffee -100tk \n 2.Cold Coffee -80tk \n");
         scanf("%d", &in);

         switch (in)
         {
         case 1:
            printf("Special Hot Coffee served\n");
            total_cost += 100;
            break;
         case 2:
            printf("Cold Coffee served\n");
            total_cost += 80;
            break;
         }
      }
      printf("total cost = %dtk\n", total_cost);
   }

   return 0;
}

Variables

• int in = 0;

  • This variable stores the user's input for menu selection.

• int total_cost = 0;

  • This variable keeps track of the total cost of the items selected by the user.

Menu Loop

The program runs a loop that continuously prompts the user to select a category and an item until the user decides to exit.

while (in != 4)
{
    printf("Category :\n 1.Pizza \n 2.Burger \n 3.Coffee \n 4.Exit \n");
    scanf("%d", &in);

• The loop continues as long as the user does not choose option 4 (Exit).

Category and Item Selection

Depending on the user's input, the program displays a list of items within the selected category. The user then selects an item, and the program updates the total cost accordingly.

Pizza Category

if (in == 1)
{
    printf("Items :\n 1.Cheese Fountain -235 tk \n 2.Meaty Onion -240tk \n 3.Tender Beef -400tk \n");
    scanf("%d", &in);

    switch (in)
    {
    case 1:
        printf("Cheese Fountain served\n");
        total_cost += 235;
        break;
    case 2:
        printf("Meaty Onion served\n");
        total_cost += 240;
        break;
    case 3:
        printf("Tender Beef served\n");
        total_cost += 400;
        break;
    }
}

• If the user selects the Pizza category, they are presented with three pizza options. Based on the user's selection, the corresponding item is served, and its cost is added to total_cost.

Burger Category

else if (in == 2)
{
    printf("Items :\n 1.Juicy BOMB -175tk \n 2.BBQ -200tk \n");
    scanf("%d", &in);

    switch (in)
    {
    case 1:
        printf("Juicy BOMB served\n");
        total_cost += 175;
        break;
    case 2:
        printf("BBQ served\n");
        total_cost += 200;
        break;
    }
}

• If the user selects the Burger category, they are presented with two burger options. Based on the user's selection, the corresponding item is served, and its cost is added to total_cost.

Coffee Category

else if (in == 3)
{
    printf("Items :\n 1.Special Hot Coffee -100tk \n 2.Cold Coffee -80tk \n");
    scanf("%d", &in);

    switch (in)
    {
    case 1:
        printf("Special Hot Coffee served\n");
        total_cost += 100;
        break;
    case 2:
        printf("Cold Coffee served\n");
        total_cost += 80;
        break;
    }
}

• If the user selects the Coffee category, they are presented with two coffee options. Based on the user's selection, the corresponding item is served, and its cost is added to total_cost.

Total Cost Display

After each item selection, the program prints the current total cost.

printf("total cost = %dtk\n", total_cost);

Program Exit

The program exits the loop and terminates when the user selects the Exit option.

return 0;

• The main function returns 0, indicating successful execution of the program.

Conclusion

This program provides a simple way to navigate through a menu, select items, and calculate the total cost. The use of loops, conditional statements, and switch cases makes the code easy to understand and extend for more categories or items.