header question

[madjas]

i have this code that im gettin this error "1>Build log was saved at "file://c:\Users\madjao\Documents\Visual Studio 2008\Projects\school\Debug\BuildLog.htm"
where am i wrong??????

/*
   Simple program to compute the two possible roots of a quadratic equation.
*/

#include <iostream>
#include <iomanip>
#include <cmath>
#include"helper.h"
#include <ostream>

using namespace std;

struct cmplxNumber{
   double dReal, dImaginary;
} ;

bool ComputeRoots( double dCoefA, double dCoefB, double dCoefC, 
          cmplxNumber & Root1, cmplxNumber & Root2);

ostream & PrintComplex( ostream & outDevice, cmplxNumber Root );

int main()
{
   // Need some variable storage for parameters
   double dCoefA = 0.0, dCoefB = 0.0, dCoefC = 0.0;

   cout << "Enter coefficient A: ";
   cin >> dCoefA;
   cout << "Enter coefficient B: ";
   cin >> dCoefB;
   cout << "Enter coefficient C: ";
   cin >> dCoefC;


   cmplxNumber Root1, Root2;
   ComputeRoots( dCoefA, dCoefB, dCoefC, Root2, Root1 );

   cout << "\n\nThe first root is " << Root1.dReal;
   if( Root1.dImaginary < 0.0 ) {
      cout << " - " << abs(Root1.dImaginary) << " j" << endl;
   }
   else if( Root1.dImaginary > 0.0 ) {
      cout << " + " << Root1.dImaginary << " j" << endl; 
   }
   else 
      cout << endl;
   
   cout << "\n\nThe second root is ";
   PrintComplex( cout, Root2 );
 
   system("pause");
   return 0;
}


bool ComputeRoots( double dCoefA, double dCoefB, double dCoefC, 
          cmplxNumber & Root1, cmplxNumber & Root2)
{
	double dInter1, dInter2;
	dInter1 = dCoefB * dCoefB;  // get the square of B
	dInter2 = 4.0 * dCoefA * dCoefC;
	if(dInter1 < dInter2 ) {
	 	Root1.dImaginary = pow(abs(dInter1 - dInter2), 0.5)/ (2.0 * dCoefA);
		Root2.dImaginary = -pow(abs(dInter1 - dInter2), 0.5)/ (2.0 * dCoefA);
		Root1.dReal = Root2.dReal = -dCoefB / (2.0 * dCoefA);
	} else {
		Root1.dReal = (-dCoefB + pow(dInter1 - dInter2, 0.5))/ (2.0 * dCoefA);
		Root2.dReal = (-dCoefB - pow(dInter1 - dInter2, 0.5))/ (2.0 * dCoefA);
	}
	return true;
}

and this is the header

#ifndef _helper
#define _helper


ostream & PrintComplex( ostream & outDevice, cmplxNumber Root )
{
   outDevice << Root.dReal;
   if( Root.dImaginary < 0.0 ) {
      outDevice << " - " << abs(Root.dImaginary) << " j" << endl;
   }
   else if( Root.dImaginary > 0.0 ) {
      outDevice << " + " << Root.dImaginary << " j" << endl; 
   }
   else 
      cout << endl;
   return outDevice;
}
#endif 

[firedraco]

1) Wrong section.
2) That is not an error.

[madjas]

i meant this error

"1 : fatal error C1083: Cannot open include file: 'helper.h': No such file or directory"

[LB]

1. Click "Edit Topic" at the top of your post and change the forum to either Beginners or General C++ Programming. Thanks :)
2. Is the header named "helper.h" and is it in the same exact directory as the file you are trying to include it in?

[madjas]

what im trying to do is to create a multi project file that contains header files related complex data type that is defined and a helper code file containing the functions related specifically to the complex numbers. but i have to use this program in order to do this

#include <iostream>
#include <iomanip>
#include <cmath>

#include <ostream>

using namespace std;

struct cmplxNumber{
   double dReal, dImaginary;
} ;

bool ComputeRoots( double dCoefA, double dCoefB, double dCoefC, 
          cmplxNumber & Root1, cmplxNumber & Root2);

ostream & PrintComplex( ostream & outDevice, cmplxNumber Root );

int main()
{
   // Need some variable storage for parameters
   double dCoefA = 0.0, dCoefB = 0.0, dCoefC = 0.0;

   cout << "Enter coefficient A: ";
   cin >> dCoefA;
   cout << "Enter coefficient B: ";
   cin >> dCoefB;
   cout << "Enter coefficient C: ";
   cin >> dCoefC;


   cmplxNumber Root1, Root2;
   ComputeRoots( dCoefA, dCoefB, dCoefC, Root2, Root1 );

   cout << "\n\nThe first root is " << Root1.dReal;
   if( Root1.dImaginary < 0.0 ) {
      cout << " - " << abs(Root1.dImaginary) << " j" << endl;
   }
   else if( Root1.dImaginary > 0.0 ) {
      cout << " + " << Root1.dImaginary << " j" << endl; 
   }
   else 
      cout << endl;
   
   cout << "\n\nThe second root is ";
   PrintComplex( cout, Root2 );
 
   system("pause");
   return 0;
}


bool ComputeRoots( double dCoefA, double dCoefB, double dCoefC, 
          cmplxNumber & Root1, cmplxNumber & Root2)
{
	double dInter1, dInter2;
	dInter1 = dCoefB * dCoefB;  // get the square of B
	dInter2 = 4.0 * dCoefA * dCoefC;
	if(dInter1 < dInter2 ) {
	 	Root1.dImaginary = pow(abs(dInter1 - dInter2), 0.5)/ (2.0 * dCoefA);
		Root2.dImaginary = -pow(abs(dInter1 - dInter2), 0.5)/ (2.0 * dCoefA);
		Root1.dReal = Root2.dReal = -dCoefB / (2.0 * dCoefA);
	} else {
		Root1.dReal = (-dCoefB + pow(dInter1 - dInter2, 0.5))/ (2.0 * dCoefA);
		Root2.dReal = (-dCoefB - pow(dInter1 - dInter2, 0.5))/ (2.0 * dCoefA);
	}
	return true;
}

// declaration of function using 'things' from the stream devices is 
//  fairly exacting.  MUST use references to the device variables.
ostream & PrintComplex( ostream & outDevice, cmplxNumber Root )
{
   outDevice << Root.dReal;
   if( Root.dImaginary < 0.0 ) {
      outDevice << " - " << abs(Root.dImaginary) << " j" << endl;
   }
   else if( Root.dImaginary > 0.0 ) {
      outDevice << " + " << Root.dImaginary << " j" << endl; 
   }
   else 
      cout << endl;
   return outDevice;

[LB]

You didn't answer my question; is the helper.h file actually in the same folder as that file that has the code you're trying to compile?

[madjas]

no the helper.h file was created. the code that im trying to compile is in the source folder and the helper.h file is in the header file. all i did was add a .h file to header folder then i copy the code and i paste on that helper.h