scopepitfall.cpp

来自「tkugukl.rar c++初学者,指正使用例子」· C++ 代码 · 共 23 行

// THIS PROGRAM IS DESIGNED TO HAVE A FAULT - IT IS USED TO 
// DEMONSTRATE A COMMON PITFALL.  SEE ARTICLE FOR DETAILS.

#include <stdio.h>

int *pPointer;

void SomeFunction();
{
	int nNumber;
	nNumber = 25;	

	// make pPointer point to nNumber:
	pPointer = &nNumber;
}

void main()
{
	SomeFunction(); // make pPointer point to something

	// why does this fail?
	printf("Value of *pPointer: %d\n", *pPointer);
}