?? xbessi1.c
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/* Driver for routine bessi1 */#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 I1",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 %12s %13s \n","x","actual","bessi1(x)"); for (i=1;i<=nval;i++) { fscanf(fp,"%f %f",&x,&val); printf("%6.2f %12.7f %12.7f\n",x,val,bessi1(x)); } fclose(fp); return 0;}#undef NRANSI?? 快捷鍵說明
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