7viii.cpp

《C/C＋＋程序设计导论（第二版）》一书的程序源文件

#include <iostream.h>
#include <ctype.h>

// GetLetter()  Prompt the user for an uppercase letter. Ignore
// all entries that are not valid letters until one is entered.
//  Return the first valid uppercase letter entered.
char GetLetter()
{	char letter;
	cout << "Enter an uppercase letter: ";
	do
		cin >> letter;
	while (!isupper(letter));
	return (letter);
}
void main ()
{	cout << GetLetter();
}