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Hi every one,

i got a trouble with opening and reading multi files (200 files) in. These files include 4 columns and 1010 rows. event i have tried many times but it still can not work. if possible, could you please give me some suggestion on my code as the following?

```
void snapshot::snapshot_mean(double U[Smax+3][Xmax][Ymax])
{
int i,j,k,m;
double sum = 0.0;
char file_name[50];
char file_list[10];
// double U1[200][TSpcs+3][Xmax][Ymax];
double ****U1;
// Set the temporary valuables
U1 = new double *** [200];
for(m=1;m<=200; m++) U1[m] = new double **[TSpcs+4];
for(m=1;m<=200; m++){
for(k=0;k<=TSpcs+3; k++) U1[m][k] = new double *[Xmax];
}
for(m=1;m<=200; m++){
for(k=0;k<=TSpcs+3; k++) {
for (i=0; i<Xmax; i++) U1[m][k][i]= new double [Ymax];
}
}
// Set the initial values of U_mean
for(j=0; j<=d+8; j++){
for(i=0; i<=l+8; i++) {
for(k=1; k<=TSpcs+3; k++){
U_mean[k][i][j] = 0.0;
}
}
}
// open and read snapshots in, then compute sum of snapshots
for(m=1;m<=200;m++){
strcpy(file_name,"./outdata/conserv");
sprintf(file_list, "%d", (int)m);
strcat(file_name, file_list);
strcat(file_name, ".dat");
ifstream fin(file_name,ios::in | ios::binary);
if(!file_name) {
cerr << "Error: file could not be opened" << endl;
exit(1);
}
for(j=0; j<=d+8; j++){
for(i=0; i<=l+8; i++) {
for(k=1; k<=TSpcs+3; k++){
fin.read((char *) &U[k][i][j], sizeof(double));
if(ABS(U[k][i][j]) <= 1.0e-20) U[k][i][j] = 0.0;
U1[m][k][i][j] = U[k][i][j];
// cout<<U[k][i][j]<<" \n";
}
}
}
fin.close();
}
// Compute mean 0f snapshots
for(m=1;m<=200;m++){
for(j=0; j<=d+8; j++){
for(i=0; i<=l+8; i++) {
for(k=1; k<=TSpcs+3;k++){
U_mean[k][i][j] = U_mean[k][i][j] + U1[m][k][i][j];
}
}
}
}
for(j=0; j<=d+8; j++){
for(i=0; i<=l+8; i++) {
for(k=1; k<=TSpcs+3;k++){
U_mean[k][i][j] = U_mean[k][i][j]/8;
cout<<U_mean[k][i][j]<<" \n";
}
}
}
// Store new snapshot
for(m=1;m<=200;m++){
strcpy(file_name,"./outdata/new_snapshot");
sprintf(file_list, "%d", (int)m);
strcat(file_name, file_list);
strcat(file_name, ".dat");
ofstream out(file_name);
for(j=0; j<=d+8; j++) {
for(i=0; i<=l+8; i++) {
for(k=1; k<=TSpcs+3; k++) out<<(U1[m][k][i][j] - U_mean[k][i][j])<<" ";
// for(k=1; k<=TSpcs+3; k++) out<<U_mean[k][i][j]<<" ";
out<<"\n";
}
}
out.close();
}
}
```

Thank you very much in advance,

Bomtk.,