suzukiplan/piano.c

## piano.c
/* 88鍵ピアノの音階周波数 & サンプリング周波数1Hzあたりのラジアン増分を求めて表示 */
#include <stdio.h>

#define S 44100.00
#define B 1.0594631
#define PI  3.1415926535897932
#define PI2 6.2831853071795864

int main(int argc,char* argv[])
{
	const char* t[12]={
		 "A "
		,"A#"
		,"B "
		,"C "
		,"C#"
		,"D "
		,"D#"
		,"E "
		,"F "
		,"F#"
		,"G "
		,"G#"
	};
	double hz[88];
	int n=0;
	double a=13.75;
	double b;
	for(n=0;n<88;n++) {
		if(n%12==0) {
			a*=2.0;
			hz[n]=a;
		} else {
			hz[n] = hz[n-1] * B;
		}
		b=PI2/(S/hz[n]);
		printf("%s : %9.4fHz : %.4f rad/1Hz\n",t[n%12],hz[n],b);
	}
	return 0;
}
	/* 88鍵ピアノの音階周波数 & サンプリング周波数1Hzあたりのラジアン増分を求めて表示 */
	#include <stdio.h>

	#define S 44100.00
	#define B 1.0594631
	#define PI 3.1415926535897932
	#define PI2 6.2831853071795864

	int main(int argc,char* argv[])
	{
	const char* t[12]={
	"A "
	,"A#"
	,"B "
	,"C "
	,"C#"
	,"D "
	,"D#"
	,"E "
	,"F "
	,"F#"
	,"G "
	,"G#"
	};
	double hz[88];
	int n=0;
	double a=13.75;
	double b;
	for(n=0;n<88;n++) {
	if(n%12==0) {
	a*=2.0;
	hz[n]=a;
	} else {
	hz[n] = hz[n-1] * B;
	}
	b=PI2/(S/hz[n]);
	printf("%s : %9.4fHz : %.4f rad/1Hz\n",t[n%12],hz[n],b);
	}
	return 0;
	}