8ii.cpp

来自「《C/C＋＋程序设计导论（第二版）》一书的程序源文件」· C++ 代码 · 共 19 行

// total.cpp  Report the total of all accounts
#include <iostream.h>
#include <fstream.h>
void main ()
{	int acntnum;					// an account num.
	float balance;					// an account balance
	int n;
	float sum = 0.0;
	ifstream infile;					// a file var. for the input

	infile.open ("accnts.dat");					// prepare file for reading

	for (n=0; n<3; n++)					// sum 3 accounts...
	{	infile >> acntnum >> balance;
		sum += balance;
	}
	cout << "The total of all accounts is: " << sum << endl;
}