C++ Primer Plus笔记: 2023.07.18

第六章编程题
（8）

#include 
#include 
#include 
using namespace std ;

int main()
{
	ifstream inFile ;
	string filename ;
	cout << "Enter the file name: " ;
	cin >> filename ;
	inFile.open(filename) ;
	
	if(!inFile.is_open())
	{
		cout << "Could not open the file " << filename << ".\n" ;
		cout << "Program terminating..." << endl ;
		exit(EXIT_FAILURE) ;	
	}
	
	char ch ;
	int count = 0 ;
	inFile >> ch ;
	while (inFile.good())
	{
		count ++ ;
		inFile >> ch ;
	}
	
	if (inFile.eof())
		cout << "This file has " << count << " characters.\n" ;
	
	inFile.close() ;
	return 0 ;
}

顺带说一句，在Ubuntu的文件中，哪怕只写一行且不敲回车键，还是有换行符存在的

(9)

#include 
#include 
#include 
using namespace std ;

ifstream inFile ;

const int NameSize = 30 ;
struct Contributor
{
	char name[NameSize] ;
	double money ;
} ;

int main()
{
	string filename ;
	cout << "Enter the file's name: " ;
	cin >> filename ;
	inFile.open(filename) ;
	
	if (!inFile.is_open())
	{
		cout << "File " << filename << " doesn't exit.\n" ;
		cout << "Program terminating...\n" ;
		exit(EXIT_FAILURE) ;
	}
	
	int population ;
	inFile >> population ;
	inFile.get() ;
	
	Contributor *  volunteer = new Contributor[population] ;
	for (int i=0; i<population; i++)
	{
		inFile.get(volunteer[i].name, NameSize).get() ;
		inFile >> volunteer[i].money ;
		inFile.get() ;
	}
	
	cout << "Grand Patrons:\n" ;
	for (int i=0; i<population; i++)
	{
		if (volunteer[i].money > 10000)
		{
			cout << volunteer[i].name << endl ;
			cout << volunteer[i].money << endl ;
			volunteer[i].money = 0 ;
		}
	}
	
	cout << "\nPatrons:\n" ;
    for (int i=0; i<population; i++)
    {
		if (volunteer[i].money)
        {
			cout << volunteer[i].name << endl ;
            cout << volunteer[i].money << endl ;
        }
	}

	inFile.close() ;
	delete [] volunteer ;
}

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