COMMANDS, FUNCTIONS, AND OTHER DETAILS in Software

Make QR in Software COMMANDS, FUNCTIONS, AND OTHER DETAILS

COMMANDS, FUNCTIONS, AND OTHER DETAILS
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Sound ExprN1,ExprN2{,ExprN3} Makes the PC speaker create a sound at the frequency ExprN1 for a duration of ExprN2 milliseconds. The optional parameter ExprN3 is either true or false. If it is true then the sound is made in the background and if it is false the sound will stop the system for the duration of the note. Your program will still pause until the note nishes but the Windows operating system will not be paused if ExprN3 is true. The default for ExprN3, if you do not specify it, is true. Speaker ExprN This will turn the speaker off if ExprN is zero (off) or on if ExprN is other than zero (on). The notes played with the Sound command will play and will take the time required but no sound will be heard if the speaker is turned off. The speaker is on by default upon the start of the program. PlaySong ExprS This will play a song de ned by the string ExprS. The string will contain notes and other specs as de ned below:
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The notes are A, A#, B, C, C#, D, D#, E, F, F#, G, G#, also P which is a pause. You can use lower or upper case. The # must immediately follow a note or it will be ignored. Immediately after de ning the note you can specify a number to de ne the duration of the note. This number can be any number greater than 0 and is usually 1, 2, 4, 8, 16, 32, or 64. But you can specify any number you desire. The number will be used to calculate the duration of the note by dividing into the de ned tempo (see later). The formula is Duration = Tempo/Number. You do not need to de ne duration all the time. If a note does not have a duration de ned after it then the duration last de ned will be used. If you have not previously de ned duration for a previous note then the duration will be 8 by default. You de ne a tempo for the song and can change it at any time by specifying the letter T followed by a number. The number will be in milliseconds. So if you say T1500 then the tempo will be 1 and half seconds. If you never de ne a tempo then it will be 1000 (i.e., 1 second) by default. You can de ne a scale for the song and can change it any time by specifying the letter S followed by a number. The number must be in the range 0 to 6. This means that there are 7 scales and scale 3 is the middle C scale. If you never de ne a scale it will be 4 by default. If you de ne a number greater than 6 it will be made to be 6. The letter P is taken to be a pause of the duration de ned as for the notes (see above). If the speaker is off (see the command Speaker ExprN) then the song will play but
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no sound will be heard.
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The following example will play a song with the scale being 4 to start with then it will be changed to 3. Also the tempo will start as 1000 and will be changed to 1500 afterward. The notes A and B will play at 8th and then the rest will be played at 16th
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PlaySong abc16dc#T1500dgS3abdg#
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The following will play the song Jingle Bells followed by La Cucaracha. Notice how you have versatility in de ning and playing the songs. Also notice how the scale is changed in the La Cucaracha song.
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