?? xfactln.c
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/* Driver for routine factln */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h>#define NRANSI#include "nr.h"#include "nrutil.h"#define MAXSTR 80int main(void){ char txt[MAXSTR]; int i,n,nval; float 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,"N-factorial",11)) { fgets(txt,MAXSTR,fp); if (feof(fp)) nrerror("Data not found in fncval.dat\n"); } fscanf(fp,"%d %*s",&nval); printf("\nlog of n_factorial\n"); printf("\n%6s %19s %21s\n","n","actual","factln(n)"); for (i=1;i<=nval;i++) { fscanf(fp,"%d %f",&n,&val); printf("%6d %20.7f %20.7f\n",n,log(val),factln(n)); } fclose(fp); return 0;}#undef NRANSI?? 快捷鍵說明
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