8iii.cpp

《C/C＋＋程序设计导论（第二版）》一书的程序源文件

// report.cpp  Report the balance of a specific account
#include <iostream.h>
#include <fstream.h>
void main ()
{	int acntnum, search;					// account numbers
	float balance;					// an account balance
	ifstream infile;					// input file variable
	int n, done = 0;

	infile.open ("accnts.dat");					// prepare file for reading...
	cout << "Enter account number: ";
	cin >> search;					// get accnt num. from user
	for (n=0; n<3 && !done; n++)
	{	infile >> acntnum >> balance;				// read an account...
		if (acntnum == search)				// found!
		{	cout << "balance is: " << balance;
			done = 1;
		}
	}
}