xcaldat.c

Numerical Recipes in C的源代码

/* Driver for routine caldat */

#include <stdio.h>
#include "nr.h"
#include "nrutil.h"

#define MAXSTR 80

main()
{
	int i,id,idd,im,imm,iy,iyy,n;
	long j;
	char dummy[MAXSTR];
	static char *name[]={"","january","february","march",
		"april","may","june","july","august",
		"september","october","november","december"};
	FILE *fp;

	/* Check whether caldat properly undoes the operation of julday */
	if ((fp = fopen("dates1.dat","r")) == NULL)
		nrerror("Data file dates1.dat not found\n");
	fgets(dummy,MAXSTR,fp);
	fscanf(fp,"%d %*s ",&n);
	printf("\n %14s %43s\n","original date:","reconstructed date");
	printf("%8s %5s %6s %15s %12s %5s %6s\n","month","day","year",
		"julian day","month","day","year");
	for (i=1;i<=n;i++) {
		fscanf(fp,"%d %d %d ",&im,&id,&iy);
		fgets(dummy,MAXSTR,fp);
		j=julday(im,id,iy);
		caldat(j,&imm,&idd,&iyy);
		printf("%10s %3d %6d %13ld %16s %3d %6d\n",name[im],
			id,iy,j,name[imm],idd,iyy);
	}
	fclose(fp);
	return 0;
}