## Programing Music - All about JUCE, C++, Python and other programming languages and frameworks for programming music.

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Undo
All about creating the tools for editing music on the computer.
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I want to start this topic with a little and very interesting program → Calculate the frequency of a MIDI Note number. How we can know, each musical note has the own frequency and a MIDI number. For example, Midi note number 73(C#5) has frequency 554.365262 Hz.
https://www.inspiredacoustics.com/en/MIDI_note_numbers_and_center_frequencies

This program is written in the C program language and has the following code.

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

int main()
{
double c5, c0, semitoe_ratio, frequency;
int midinote;
char message;
char *result;

semitoe_ratio = pow(2, 1.0 / 12);
c5 = 220.0 * pow(semitoe_ratio, 3);
c0 = c5 * pow(0.5, 5);

printf("Enter MIDI note (0 - 127): " ;
result = gets(message);
if (result == NULL)
{
printf("There was an error reading the input.\n" ;
return 1;
}
if (message == '\0')
{
printf("Have a nice day!\n" ;
return 1;
}
midinote = atoi(message);
if (midinote < 0)
{
printf("Sorry - %s is a bad MIDI note number\n", message);
return 1;
}
if (midinote > 127)
{
printf("Sorry - %s is beyound the MIDI range!\n", message);
return 1;
}

frequency = c0 * pow(semitoe_ratio, midinote);
printf("frequeny of MIDI note %d = %f\n", midinote, frequency);

getch();
return 0;
} Also, I put here the midi2freq.exe program for windows.
1. more than a month ago
2. # 1
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