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[求助]C做的一个程序，读不进去数据哦~~~

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电梯直达

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发表于 2005-5-8 22:14 |只看该作者 |倒序浏览

|招呼Ta 关注Ta

<

>这是求矩阵的列的平均值的程序
<

>#include<stdio.h>
#define N 100
#define M 20
<

>void main()
{
FILE *fa,*fb;
char filename[30];
int n,m,i,j;
double a[N*M]={0.0},b[M]={0.0};
<

> printf("

lease input the number of columns and lines of matrix:n,m\n",N,M);
scanf("%d%d",&n,&m);
<

> while(n>N||n<=0||m>M||m<=0)
{
printf("

lease input number of matrix:n(0<n<N),m(0<m<M)again!\n",N,M);
scanf("%d%d",&n,&m);
}
<

> printf("

lease input a filename:\n");
printf("\n");
scanf("%s",filename);
<

> if((fa=fopen(filename,"r"))==NULL)
{
 printf("File is not exist.Please creat a file.\n");
 exit(0);
}

 while(!feof(fa))
 {
for(i=0;i<m;i++)
fscanf(fa,"%f",&a);
- P5 F" s2 P" P) S# ~: Q printf("%f",a);5 W/ o' h9 h2 ?
 }# D( `8 ]3 h9 B8 O7 q8 j: J
<> for (i=0;i<n;i++)
2 {& n! e* N4 R7 U9 P for (j=0;j<m;j++)6 n* W* h; N/ ^2 a9 e
 if (j==m-1) printf("%15.2f\n",a[i*m+j]);3 d l5 ^4 t- p% E$ l
 else printf("%15.2f",a[i*m+j]);" Y4 b4 r) z" O+ ~' y8 G9 p
<> for(i=0;i<m;i++)9 q' k. f4 l7 ~7 [3 z
 {* X3 ?3 s& c0 ~- o% a
for(j=0;j<n;j++)& L- E9 i f, R- I
b+=1.0/n*a[i+j*m];
5 a( x1 _$ w' {/ z }! Y0 o7 l. n4 B7 y+ B) g' `
<>6 S5 b! V# k7 N
 fclose(fa);) k8 k7 ?! K; Z) [# B. A) U
<> if((fb=fopen("result.txt","w"))==NULL)
$ s! Y& V1 Y' v, o {
( e' H* f! f, n- l printf("Result file do not exist.\n");
! a0 i Z3 U% W1 w: R exit(0);
* U+ j' r9 H7 {$ M }4 B6 P: ]7 D' n
<> else
: U, a7 b. l D5 T5 g1 `0 C& [4 \. I {2 ~. R9 K' y) u8 O) f, ^: I4 A
fprintf(fb,"The average of matrix:\n");
) i- T% c& k. V* n4 D fprintf(fb,"\n");( H2 u1 q3 H u2 M4 L) G, a
for(i=0;i<m;i++)
! X* d& z: w0 S: O" s# Q4 z+ b fprintf(fb,"%15.3f",b);
8 r h' y1 `! q fprintf(fb,"\n");8 v7 ?. Q# T. Z
 }% ]' _8 ]: d* c4 `% z1 a
 fclose(fb);
" U0 W# V1 r6 m% Y @, u0 Z/ q! ^ printf("Have done!The result in file:result.txt\n");
! Q! E, C& z7 n/ h. V8 c4 H c9 C# ~<>}