add numerical recipes library

lib/nr/ansi/examples/xjulday.c

@@ -0,0 +1,44 @@
+
+/* Driver for routine julday */
+
+#include <stdio.h>
+#include <stdlib.h>
+#define NRANSI
+#include "nr.h"
+#include "nrutil.h"
+
+#define MAXSTR 80
+
+int main(void)
+{
+	int i,id,im,iy,n;
+	char txt[MAXSTR];
+	static char *name[]={"","january","february","march",
+		"april","may","june","july","august","september",
+		"october","november","december"};
+	FILE *fp;
+
+	if ((fp = fopen("dates1.dat","r")) == NULL)
+		nrerror("Data file dates1.dat not found\n");
+	fgets(txt,MAXSTR,fp);
+	fscanf(fp,"%d %*s ",&n);
+	printf("\n%5s %8s %6s %12s %9s\n","month","day","year",
+		"julian day","event");
+	for (i=1;i<=n;i++) {
+		fscanf(fp,"%d %d %d ",&im,&id,&iy);
+		fgets(txt,MAXSTR,fp);
+		printf("%-10s %3d %6d %10ld %5s %s",name[im],id,iy,
+			julday(im,id,iy)," ",txt);
+	}
+	fclose(fp);
+	printf("\nYour choices: (negative to end)\n");
+	printf("month day year (e.g. 1 13 1905)\n");
+	for (i=1;i<=20;i++) {
+		printf("\nmm dd yyyy ?\n");
+		scanf("%d %d %d",&im,&id,&iy);
+		if (im < 0) return 0;
+		printf("julian day: %ld \n",julday(im,id,iy));
+	}
+	return 0;
+}
+#undef NRANSI