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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);
' ~) w# H8 j5 a- G3 E6 k' j printf("%f",a);
" P' \( Y2 Y9 D* I4 { }1 F' N/ o! E5 P" [; M9 v7 \0 u& y
<> for (i=0;i<n;i++)
& @1 h# X5 N: C for (j=0;j<m;j++)& y, V7 S4 q7 w" J; X/ U
 if (j==m-1) printf("%15.2f\n",a[i*m+j]);$ z+ }: [& i1 n; {% k$ I
 else printf("%15.2f",a[i*m+j]);% l4 q! F& b3 n: B5 F. C0 M+ K
<> for(i=0;i<m;i++)
1 |& m& v4 U& b- M# F0 \9 _ {
/ W/ C" |; ^6 g. C$ J for(j=0;j<n;j++)" p+ `9 G: M- ~! Z- k4 u% Z
b+=1.0/n*a[i+j*m];9 H; @8 v( V/ a, W8 S4 k# B
 }
) T* R! V" c4 y' Y<>) e. o& d" \5 E" k4 b* \$ U1 f$ W
 fclose(fa);
2 T9 ^4 k( f" o$ x<> if((fb=fopen("result.txt","w"))==NULL)3 b0 P' j! S/ V( v+ {- o
 {
2 s$ ~, q6 q1 X5 ^% l9 T printf("Result file do not exist.\n");
$ [ _8 a* E8 k% o4 W- [! t. Q exit(0);! a3 \8 P) s/ I V- u9 K2 v
 }! R2 E0 E) {1 D- Q2 [8 Y
<> else. o- K+ }( i6 m& x+ P2 \
 { j4 j4 P: h: {1 h/ _" {+ |, E
fprintf(fb,"The average of matrix:\n");
' M- U) F9 {3 g7 w: q! ~. H7 H4 D) d fprintf(fb,"\n");
" c7 [5 s b. ~3 O% h4 G+ U: k for(i=0;i<m;i++); |' M$ R8 o3 A* m: g( k# o
fprintf(fb,"%15.3f",b);
0 y/ i3 f8 C) Q7 m5 ~ f fprintf(fb,"\n");5 ~7 J& _) Q; I
 }7 t: \+ v3 W1 ]4 N9 c: S
 fclose(fb);
1 T4 ^% r) s, K printf("Have done!The result in file:result.txt\n");
6 w# k7 {% w. L! g" w<>}