main.c

这是一个用C语言编写的计算误差函数的程序。其主要特点是从定义出发

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define N 10000
#define pi 3.1415926

float erf( float x)
{
  static float erff[N];
  static int i;
  static float t,x;
  for(i=0;i<N;i++){
      erff[i]=0.0;
  }
  for(i=1;i<N;i++){
      erff[i]=erf[i-1]+(2/pow(pi,0.5))*(x/N)*exp(-pow((x*i/N),2.0));
  }
  return erf
  main()
{
  static float erf[N];
  static int i;
  static float t,x;
   FILE  *fp, *fopen();
   for(i=0;i<N;i++){
      erf[i]=0.0;
  }
   printf("Please input t-->");
   scanf("%f",&t);
   x=t;
   printf("x=%f \n",x);
   for(i=1;i<N;i++){
      erf[i]=erf[i-1]+(2/pow(pi,0.5))*(x/N)*exp(-pow((x*i/N),2.0));
      printf("erf[i]= %15.12f\n",erf[i]);
  }


}