Question

This should be programmed in C LANGUAGE!
This lab requires you to use arrays, loop structures and if statements/switch statements. You must use functions where indicated. Test your program often - make sure each bit of functionality works before you continue.

In this problem, we want to create a song and play it as we build it. The way we do this is by using arrays to store different notes. Notes are just tones that run for a specific amount of time. To play a note, you will use the beep function that is defined in the directive #include . Here is an example on how to use the function.

Beep(440, 2000); // Beeps at 440 Hz for 2 seconds

You will need to clear the screen for this program. You can do this by using system(“cls”).

Here is a description of what the program needs to do:

1. You want to create a program that displays a menu with three options:

a. Build the song

b. Play the song

c. Quit You must use a function to do this.

2. You then ask the user to enter a menu option. The program should treat upper and lower case values the same. For example a and A should be treated the same (Build the song).

3. If the user enters an invalid menu selection (ie it is not a or b or c), then display an error message and reprint the menu so that they can try again. HINT - you need a loop for this.

4. After option a or b is executed (ie you do what needs to be done for these options - see points 5 and 6), the menu should display again. The screen should be cleared before the menu is displayed again.

5. Each time the user selects option a, the program should ask them to enter a frequency (float) and a duration (int)1 . These values will be saved into the next available spot in two arrays - one for frequency and one for duration.

6. Assume the maximum number of notes that can be entered is 100. Do not allow the user to enter more than this.

7. When the user selects option b, the program will play the song that the user entered via option a.

8. Include your name and student number in your screen display.

Answer 1

Solution:

#include<stdio.h>

#include<windows.h>

// global variables

int i=0;

int duration[100];

float frequency[100];

//Function to insert the values into the array

void build()

{

    float freq;

    int t;

    printf("Enter the Frequency :");

    scanf("%f",&freq);

    frequency[i] = freq;

    printf("Enter the duration :");

    scanf("%d",&t);

    duration[i] =  t;

    i++;

}

//Function to play the notes

void play()

{

    int j;

    for(j=0;j<i;j++)

    {

        //cls will clear the screen for us

        system("cls");

        Beep(frequency[j],duration[j]);

        system("cls");       

    }

}

//Function to quit the program

void quit()

    {

        //exit() function will terminate the program

        exit(0);

    }

int main()

{    

    char choice;

    while(1)

    {

        //Providing menu and getting the choice

        printf("a. Build the song\nb. Play the song\nc. Quit You must use a function to do this\n");

        scanf("%c",&choice);

        

        //Using switch statements

        switch (choice)

        {

            case 'a':

                build();

                break;

            case 'A':

                build();

                break;

            case 'b':

                play();

                break;

            case 'B':

                play();

                break;

            case 'c':

                quit();

                break;

            case 'C':

                quit();

                break;

            default:

            //Printing if there is some wrong options is given

                printf("Chose the valid option\n");

                sleep(0.5);

                break;

        }  

            system("cls");

    }

}

Explanation :
  
   Initialize three global variables int , two arrays one is int array to store duration and float array to store the frequency
   Create and define three functions build , play , quit
       build() function will ask user to enter the frequency and duration of a note and store in the frequency array and duration array
       play() function will play the given notes for this we have to use Beep() function which takes two arguments frequency and duration you should include windows.h library for this function
       quit() function simply terminates the execution of program by using exit() function
      
   main function
       Here initialize a char variable
       Use while loop with 1 as condition this make loop run infinitely also we can use for loop as for(;;)
       Print the menu at each iteration and update the char variable
       using switch statements do the right opertion
           if choice is a or A then execute build()
           if choice is b or B then execute play()
           if choice is c or C then execute quit()
           if choice is not above mentioned prompt user to enter the right option and wait for 0.5 seconds , waiting can be done by using sleep() function
       At last clear the screen

NOTE:

Step 8 can be done using printf statements

Global variables can be accessed anywhere in the program if any variables even though initialized in main function it can be used only in main function that is the reason frequency array and i and duration array are used as global variables

Output:

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