Detecting errors at run time

[pieroborrelli]

Hello, I'm studying C++ by two months using the book : programming principles and practice using C++, I'm on chapter 5 now studying error reporting. The author in this chapter uses this example to show to the readers the run time errors :

    #include "std_lib_facilities.h"

    int area(int length, int width)
    {

	return length*width;

    }

    int framed_area(int x, int y)
    {

	return area(x - 2, y - 2);

    }

    int main()
    {

	int x = -1;
	int y = 2;
	int z = 4;

	
	int area1 = area(x, y);

	int area2 = framed_area(1, z); 
	int area3 = framed_area(y, z); 

}

this code produces a run-time error due to the division of area1 with 0.
Subsequently, the author introduces a facilitation contained in the header file which he wrote called error (). My problem is that when this function call should produces a system error over a string literal that we passed as an argument to the function, instead my program code at runtime produces a screen that reports:


>> Microsoft visual C++ runtime library

>> debug error!
>> program:..dio
>> 2013\Projects\learnprogramming\Debug\learnprogramming.exe
>> abort() has been called

What could be happened ? is this a problem of the function implementation ?



Here is the link of the page where you can read the header file containing the error() function : http://www.stroustrup.com/Programming/PPP2code/std_lib_facilities.h