66、请编制函数READDAT（）实现从文件IN.DAT中读取1000个十进制整数到数组XX中;再
#define MAX 1000
int xx[MAX],odd=0,even=0;
double ave1=0.0,ave2=0.0,totfc=0.0;
void WriteDat(void) ;
int ReadDat(void)
{
FILE *fp ;
if((fp=fopen("in.dat","r"))==NULL) return 1;
fclose(fp) ;
return 0 ;
}
void Compute(void)
{
}
void main()
{
int i ;
for(i=0;i<MAX;i++)
xx[i]=0;
if(ReadDat())
{printf("Can't open the data file in.dat!\007\n") ;
return;
}
Compute();
printf("EVEN=%d\nAVE1=%lf\nAVE2=%lf\nTOTFC=%lf\n", even,ave1,ave
2,totfc);
WriteDat();
}
void WriteDat(void)
{
FILE *fp;
int i;
fp=fopen("out.dat", "w") ;
fprintf(fp, "%d\n%lf\n%lf\n%lf\n",even,ave1,ave2,totfc);
fclose(fp) ;
}
/* 注：
int ReadDat(void)
{
FILE *fp ;
int i;
if((fp=fopen("in.dat","r"))==NULL) return 1;
for(i=0;i<MAX;i++)
{fscanf(fp,"%d,",&xx[i]);
if(feof(fp)) break;
}
fclose(fp) ;
return 0 ;
}
void Compute(void)
{
int i,yy[1000];
for(i=0;i<MAX;i++)
if(xx[i]%2)
{odd++;
ave1+=xx[i];
}
else
{even++;
ave2+=xx[i];
yy[even-1]=xx[i];
}
ave1/=odd;
ave2/=even;
for(i=0;i<even;i++)
totfc+=(yy[i]-ave2)*(yy[i]-ave2)/even;
}