/* 
	バイナリデータの読み書き
	number003.c
*/

#include <stdio.h>

int main(void)
{
	FILE *fp;	
	double x[] = {0.0, 1.0, -1.0, 0.5, -0.5, 0.75, -0.75, 0.1};
	
	if ((fp = fopen("test.dat", "w+")) == NULL) {
	  printf("file open error!!\n");
	  exit(-1);
	}

	fwrite(x, sizeof(double), 8, fp);  /* write a number x[0] */
	fclose(fp);    

}