请帮忙修改一下！

[danfense]

下面是我编的程序，我想把数据写到一个文件里，请各位学长帮忙，加上写入文件的语句，实现这一功能，写入mydata.dat文件吧！多谢！
#include "stdio.h"
#include "math.h"
#define A 0
#define B 0.1
#define C 1
#define D 1
#define E 1
#define W 3

void func(double x[],double z[]) {
z[0]=-10*x[0]+(10*x[1]);
z[1]=28*x[0]-x[1]-x[0]*x[2];
z[2]=(-8/3)*x[2]+x[0]*x[1];
}

void runk(double t,double b[],double h)
{
double j[W],c[W],c1[W],c2[W],k[W],l[W],m[W];
double a;
int i;
func(b,j);
a=t+h/2.0;
for(i=0;i<W;i++)
c[i]=b[i]+h/2.0*j[i];
func(c,k);
for(i=0;i<W;i++)
c1[i]=b[i]+h/2.0*k[i];
func(c1,l);
for(i=0;i<W;i++)
c2[i]=b[i]+h*l[i];
func(c2,m);
for(i=0;i<W;i++)
b[i]=b[i]+h/6*(j[i]+2*k[i]+2*l[i]+m[i]);
}

double compare(double q[])
{
double max;
if(q[0]>q[1])
max=q[0];
else
max=q[1];
if(max<q[2])
max=q[2];
return max;
}


void bianbuc(double t,double b[],double h)
{
double bf[W],b1[W],h1=h,q[W],y0[W],y1[W],max,t1;
int i,j,n=1;
for(i=0;i<3;i++)
bf[i]=b[i];
runk(t,bf,h);
printf("h is :%15.7lf\n",h);
for(j=0;j<W;j++)
{
printf("%15.7lf\t",bf[j]);
}
printf("\n");
for(j=0;;j++)
{
h1=h1/2.0;
printf("h1 is :%15.7lf\n",h1);
n=2*n;
t1=t;
for(i=0;i<W;i++)
b1[i]=b[i];
for(i=0;i<n;i++)
{
runk(t1,b1,h1);
for(j=0;j<W;j++)
{
printf("%15.7lf\t",b1[j]);
}
printf("\n");
t1=t1+h1;
}
for(i=0;i<W;i++)
q[i]=fabs(bf[i]-b1[i]);
max=compare(q);
printf("max=%lf\n",max);
if(max>1.0e-6)
{
for(i=0;i<W;i++)
bf[i]=b1[i];
}
else
{
for(i=0;i<W;i++)
b[i]=b1[i];
break;
}
}
}

main()
{
double t=A,b[W]={C,D,E},bf[W],h=B,h1=B/2.0,q[W],
y0[W],y1[W],max;
int i,n=2,j,l;

for(l=0;l<=n;l++)
{
bianbuc(t,b,h);
t=t+h;
printf("t=%lf\n",t);
}
}

[CUG87525842]

#include <stdio.h>

int main()
{
	FILE *fp;
	int i,a[5]={1,2,3,4,5},b[5];

    if (NULL==(fp=fopen("wei.txt","wb")))
    {
		printf("the file can't open\n");
    }
	
	
	
	fwrite(a,sizeof(int),5,fp);
	fclose(fp);

	 if (NULL==(fp=fopen("wei.txt","rb")))
    {
		printf("the file can't open\n");
    }

	
	
	fread(b,sizeof(int),5,fp);
	fclose(fp);
	
	for (i=0;i<5;i++)
    printf("%d ",b[i]);

	return 0;
}

这是个例子，你看看应该就会了！

[Arthur_]

把你的程序编译成exe后比如app.exe

在命令行下执行 app > mydata.dat

[chlaws]

//main add some sentence
main() 
{ 
    double     t=A,b[W]={C,D,E},bf[W],h=B,h1=B/2.0,q[W], 
    y0[W],y1[W],max; 
    int     i,n=2,j,l; 
    FILE *fp;
    if((fp=open("mydata.dat","w"))==NULL)
    {
       printf("can not open file.\n");
       return; 
     }
      for(l=0;l <=n;l++)                             
  { 
          bianbuc(t,b,h); 
          t=t+h; 
          printf("t=%lf\n",t);
          fputc(t,fp);
  } 
  fclose(fp);
}

[就呆在云上]

en ?
很简单啊
先fopen
然后fputs或者fwrite
再fclose

[ChamPagneZ]

只看到了大量的数组以及不明其义的变量.
:(
---------------------
程序看不下去啦,具体的写文件的方法同楼上.