21-4.txt

《C/C++完美演绎》源代码

/* 范例：21-4 */ 
#include <iostream.h>
class super{public: super(){cout << "super constructor";}};
void test1(int a) throw(super)
{ 	// 当 y = 0 时把错误信息类class super送出去
  if(a == 0) throw super();
}
int main()
{
  try
  {
    int x, y;
    cout << "Please Input Two Number, x/y: \n";
    cin >> x >> y;	/* 当输入y的数值是0时，会发生异常并激活异常处理类 */
    test1(y);
    cout << "x/y = " << x/y << endl;
  }
  catch(super& e)
  {
    cerr << "\n这是自定义的错误信息，防止除数y等于0!!";
  }
  puts("\n按任意键继续...");
  getchar();  
}

Project p21-4.exe raised exception class super with message 'Exception Object Address: 0x683446'.Process stopped. Use Step or Run to continue.
（上列讯息仅在Debugger设定核选Stop on C++ Exceptions才会出现）

程序执行结果：
再编译一次会输出自定义的错误信息﹕
Please Input Two Number, x/y:
5
0
super constructor
这是自定义的错误信息，防止除数y等于0!!
按任意键继续...