?? xbessy.c
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/* Driver for routine bessy */#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,n; 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,"Bessel Function Yn",18)) { 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("%4s %7s %15s %20s \n","n","x","actual","bessy(n,x)"); for (i=1;i<=nval;i++) { fscanf(fp,"%d %f %f",&n,&x,&val); printf("%4d %8.2f %18.6e %18.6e\n",n,x,val,bessy(n,x)); } fclose(fp); return 0;}#undef NRANSI
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