如何将C程序输出结果保存在一个文件里？

[liuwen20030412]

有这么一个程序我要将它的输出结果保存在E盘的filename.c文件中，下面的程序对吗？#include<stdio.h>
#include<math.h>
main()
{
FILE *fp;
double xa=0.0,xb=2.0,q=6.5,qq=0.0000028,d=0.000000002067,l=0.2,dti=0.0006,nn=61,d0=0.0007;

double s=0.0,h,x=xa,fa,fb,sum=0.0,kk,a0=0.0000012875,af=0.0000003848,aaa=0.000055064,de;

double f1[21],f2[21],ss[20],dh[20],u[20],k[20],qqq[20],z[10],aa[20],suma;

int i,j,n=20;

if((fp=fopen("e:\filename.c","w"))==NULL)
{printf("cannot open file\n");
exit(0);}

for(j=601;j<=700;j++)
{

x=xa;

q=j/100.0;

fa=1.0/(q*sqrt(2*3.1416))*exp(-(xa-1)*(xa-1)/(2*q*q));

fb=1.0/(q*sqrt(2*3.1416))*exp(-(xb-1)*(xb-1)/(2*q*q));

h=(xb-xa)/(2.0*n);

f1[0]=fa;

f2[0]=1.0/(q*sqrt(2*3.1416))*exp(-(x+h-1)*(x+h-1)/(2*q*q));

x=x+h;

s=0.0;

sum=0.0;

for(i=0;i<n;i++)

{

x=x+h;

f1[i+1]=1.0/(q*sqrt(2*3.1416))*exp(-(x-1)*(x-1)/(2*q*q));

x=x+h;

f2[i+1]=1.0/(q*sqrt(2*3.1416))*exp(-(x-1)*(x-1)/(2*q*q));
ss[i]=h/3.0*(f1[i]+f1[i+1]+4*f2[i]);
s=s+ss[i];
aa[i]=(xb-xa)/n*(i+1)*(a0-af)+af;
dh[i]=4*aa[i]/(3.1416*d0);
de=4*aaa/(3.1416*(0.01+nn*d0));
qqq[i]=qq*dh[i]*dh[i]*aa[i]/(aaa*de*de);
u[i]=qqq[i]/aa[i];
z[i]=u[i]*dti*dti/(d*l);
k[i]=1.62*pow(z[i],0.33)*d/dh[i];
sum=sum+ss[i]*qqq[i]*exp(-k[i]*aa[i]/qqq[i]);
}
suma=sum*nn;
ss[20]=h/3.0*(f1[19]+f1[20]+4*f2[19]);
s=s+ss[20];
kk=qq/aaa*log(qq/(sum*nn));
fprintf(fp,"q=%f,kk=%g,s=%g,suma=%g\n",q, kk,s,suma);
fclose(fp);
}
}

[liuwen20030412]

谢谢大家给我解答啊
我在线等呀

[scu_hurricane]

fp=fopen("e:\filename.c","w"))
fprintf(fp,"q=%f,kk=%g,s=%g,suma=%g\n",q, kk,s,suma);
应该没问题吧。

[redbad2]

同意楼上

[ShineBoy007]

fp=fopen("e:\filename.c","w"))

应是：fp=fopen("e:\\filename.c","w"))

[liuwen20030412]

大家帮我看看啊
谢谢！

[liuwen20030412]

大家帮我看看啊

[wentiboy]

如ShineBoy007(晓龙)所说的
应是：fp=fopen("e:\\filename.c","w"))
读取目录的时候,"\"会被看成转义字符,如果是"\name.c"就会被当作"\n"换行~~~~~~~
"\\"转换后才是"\",~

[tantao1982]

恩，是的。同意wentiboy

[liuwen20030412]

但我改了楼上所说的还是不行呀！

[liuwen20030412]

我把大家说过的都试过了
但是还是不行呀

[that]

在vc中可以的，函数void main ()
及exit 改为return;就可以了

[jack_wq]

1. fp=fopen("E:\\filename.c","w");
2. 把fclose(fp);放到循环的外面，文件写完之后再关闭，其实在你第一次写文件之后就给关闭了！

[jack_wq]

楼主fopen只有一次，fclose却是在循环里面！

[liuwen20030412]

都不行呀，各位老大！

[sharkhuang]

dup or dup2