Decryption console app c++

char name[100],target[100],ch,mod; //Declare Variables
char key = 97;

cout<<"Enter The Path Of A File Name Which Is To Be Decrypted : ";
cin >> name;

ifstream fin(name,ios::binary);
if(!fin) //Open The Encryped File In A Binary Mode
{
    cout<<"Error In Opening Of A File : ";
    _getch();
    return 1; //Show Error If File Does Not Exist
} //Or Any Occurs In Opening Of A File

cout<<"Enter The New Decrypted File Name : ";
cin >> target;
ofstream fout;
fout.open(target,ios::binary); //Opens The Output File In An Binary Mode
if(!fout)
{ //Show Error If Any Error Occurs In Opening Of A File
    cout<<"Error In Opening Of A Target File : ";
    _getch();
    return 1;
}

while(fin.get(ch))
{ //Opens The Encryped File
    if(ch==EOF)break;
    mod = ch + key;
    if ( mod > 255) mod -= 255;
    fout << mod;
}

fin.close(); //Close The EncryptedFile
fout.close(); //Close Your OriginalDecrypted File

cout<<"The File Is Being Decrypted............ ";
_getch();

return 0;