4elist0506.cpp

《21天学通C＋＋》附盘的原代码。书上的每个例子在这里都有相应的C语言程序。

// Listing 5.6 - demonstrates multiple return
// statements

#include <iostream>

int Doubler(int AmountToDouble);

int main()
{
	using std::cout;

	int result = 0;
	int input;

	cout << "Enter a number between 0 and 10,000 to double: ";
	std::cin >> input;

	cout << "\nBefore doubler is called... ";
	cout << "\ninput: " << input << " doubled: " << result << "\n";

	result = Doubler(input);

	cout << "\nBack from Doubler...\n";
	cout << "\ninput: " << input << "   doubled: " << result << "\n";

	return 0;
}

int Doubler(int original)
{
	if (original <= 10000)
		return original * 2;
	else
		return -1;
	std::cout << "You can't get here!\n";
}