/* Driver for routine bessk0 */#include <stdio.h>#include <stdlib.h>#include <string.h>#define NRANSI#include "nr.h"#include "nrutil.h"#define MAXSTR 80int main(void){	char txt[MAXSTR];	int i,nval;	float val,x;	FILE *fp;	if ((fp = fopen("fncval.dat","r")) == NULL)		nrerror("Data file fncval.dat not found\n");	fgets(txt,MAXSTR,fp);	while (strncmp(txt,"Modified Bessel Function K0",27)) {		fgets(txt,MAXSTR,fp);		if (feof(fp)) nrerror("Data not found in fncval.dat\n");	}	fscanf(fp,"%d %*s",&nval);	printf("\n%s\n",txt);	printf("%5s %13s %18s \n","x","actual","bessk0(x)");	for (i=1;i<=nval;i++) {		fscanf(fp,"%f %f",&x,&val);		printf("%6.2f %16.7e %16.7e\n",x,val,bessk0(x));	}	fclose(fp);	return 0;}#undef NRANSI