/* Driver for routine ellpi */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h>#define NRANSI#include "nr.h"#include "nrutil.h"#define MAXSTR 80#define FAC (3.1415926535/180.0)int main(void){	char txt[MAXSTR];	int i,nval;	float ak,alpha,en,phi,val;	FILE *fp;	if ((fp = fopen("fncval.dat","r")) == NULL)		nrerror("Data file fncval.dat not found\n");	fgets(txt,MAXSTR,fp);	while (strncmp(txt,"Legendre Elliptic Integral Third Kind",37)) {		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("%6s %6s %6s %10s %23s\n",		"phi","-en","sin(alpha)","actual","ellpi(phi,ak)");	for (i=1;i<=nval;i++) {		fscanf(fp,"%f %f %f %f",&phi,&en,&alpha,&val);		alpha=alpha*FAC;		ak=sin(alpha);		en = -en;		phi=phi*FAC;		printf("%6.2f %6.2f %6.2f %18.6e %18.6e\n",			phi,en,ak,val,ellpi(phi,en,ak));	}	fclose(fp);	return 0;}#undef NRANSI