C++Primer Plus 变量声明赋值和显示

#pragma region carropts.cpp
//carrots.cpp -- food processing program
//uses and displays a variable 
#if 1

#include <iostream>

int main(void)
{
	using namespace std;

	int carrots;			//declare an integer variable

	carrots = 25;			//assign a value to the variable

	cout << "I have ";
	cout << carrots;		//display the value of the variable 
	cout << " carrots.";
	cout << endl;

	carrots = carrots - 1; //modify the variable 
	cout << "Crunch ,crunch . Now I have  " << carrots << " carrots." << endl;
	return 0;
}

#endif 
#pragma endregion

运行测试结果，如下