//  ;-----------------------------------------------------------
//  ; Program Name:   Class_Demo								
//  ; File:           demoprob16.cpp							
//  ; Description:    Demos the matherr function
//  ; Author:         Jim Adams								
//  ; Environment:    MS C++ 6.0								
//  ; Date Written:   10/27/2001
//  ;-----------------------------------------------------------
#include <iostream.h>
#include <math.h>
#include <string.h>

double	x=0.0;
bool	math_was_good;

void main()
{
    /* Do several math operations that cause errors. The _matherr
     * routine handles _DOMAIN errors, but lets the system handle
     * other errors normally.
     */
	math_was_good=true;
	x=log(-2.0);
	if (math_was_good)
		cout << "  log(-2.0) = " << x  << endl;

	math_was_good=true;
	x=log10(-5.0);
	if (math_was_good)
		cout << "log10(-5.0) = " << x << endl;
	
	math_was_good=true;
	x=tan(45);
    if (math_was_good)
		cout << "  tan(45)  = " << x << endl;

	
}

// Handle several math errors 
int _matherr(struct _exception *except)
{
    if( except->type == _DOMAIN )
		{
        cout << "Math Error: " << except->name << "(" << except->arg1 << ")" << endl;
		math_was_good=false;
        return 1;
		}
	else
		{
		math_was_good=true;
		return 0;
		}
   
}