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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 |正序浏览

|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);" x6 o! X+ }6 h7 X7 k
printf("%f",a);& d3 L; M$ g# z$ h H2 U
 }
4 q4 W( x. V5 W' Z8 V* L<> for (i=0;i<n;i++)' o* G: I& {# Z" A9 e
for (j=0;j<m;j++)+ n& F+ i! ^, ]8 |. a8 ~3 }4 U1 d8 W
 if (j==m-1) printf("%15.2f\n",a[i*m+j]);+ d% o9 e' h6 e- a+ {2 @
 else printf("%15.2f",a[i*m+j]);
+ K8 j8 ^5 T; u! A! ^ P<> for(i=0;i<m;i++)
6 `2 I& d \7 H7 G2 _9 e2 C {
% v* @0 `. P' S' v0 l1 r for(j=0;j<n;j++)! O, k' _! G+ N- y
b+=1.0/n*a[i+j*m];. N, }) X# [+ ~1 E; m# O
 }9 [/ }- M F( ?# _+ d
<>" }! S- B$ G* n9 b: Y, ?( d
 fclose(fa);- Q) a/ H/ s$ l0 \* @3 n* v( T- W
<> if((fb=fopen("result.txt","w"))==NULL)+ D& x6 l/ u/ Z4 W6 U2 _
 {( F& l' W) q3 E1 _
printf("Result file do not exist.\n");. W, A" [, d3 q8 M+ Z3 `& y
exit(0);
) F' u3 S; B4 L; g4 p }3 [( m1 _$ T5 p( Z3 r
<> else% a. Q9 ] i7 ]- d" J# A
 {
6 {" Q% i$ h8 I: {) v5 _ fprintf(fb,"The average of matrix:\n");
: g7 `- O/ u) q/ y: l fprintf(fb,"\n");9 K6 A: O2 ~8 x, _9 F
for(i=0;i<m;i++)
/ |0 X8 \! U, t# u" i# B0 _ fprintf(fb,"%15.3f",b);& m# X( {! X& N$ z$ E% Z7 P
fprintf(fb,"\n");
& B+ U0 m S8 l3 R P- o }) T( a; Q- K4 W
 fclose(fb);+ g0 t# p1 s1 Z9 }2 Q
 printf("Have done!The result in file:result.txt\n");) D! u- A _: i- A" v
<>}