int main(){
fstream fout;
Loan account[5];
Loan tmp;
double totalLoan;
cout<<"Select"<<endl;
cout<<"0.Exit"<<endl;
cout<<"1.Write"<<endl;
cout<<"2.Read"<<endl;
char ch;
cin>>ch;
while (true)
{
switch (ch)
{
case '0':
return 0;
break;
case '1':
srand( (unsigned)time(NULL));
fout.open("Exercise12_6.dat",ios::out|ios::binary|ios::app);
for(int i=0;i<5;i++){
account[i]=Loan(rand()%10+1,rand()%10+1,rand()%100000+1);
fout.write(reinterpret_cast<char *>(&account[i]),sizeof(Loan));
}
fout.close();
cout<<"finish!!"<<endl;
break;
case '2':
totalLoan=0;
fout.open("Exercise12_6.dat",ios::in|ios::binary);
while(!fout.eof()){
fout.read(reinterpret_cast<char *>(&tmp),sizeof(Loan));
if (fout.eof())
{
break;
}
totalLoan+=tmp.getLoanAmount();
cout<<tmp.getLoanAmount()<<endl;
}
cout<<endl<<endl<<totalLoan<<endl;
fout.close();
cout<<"finish!!"<<endl;
break;
default:
cout<<"please Again!"<<endl;
break;
}
cin>>ch;
}
}
double calTotalLoanFromFile(char* filename)
{
fstream input;
input.open(filename, ios::in | ios::binary);
Loan tmp;
double totalAmount = 0;
while(!input.eof())
{
input.read(reinterpret_cast<char *>(&tmp),sizeof(Loan));
totalAmount += tmp.getLoanAmount();
}
input.close();
return totalAmount;
}