Programming Forums > Application Development > C++

The Dark · Dec 1st, 2006, 12:10 AM

Yep, that looks right, aside from indenting and extra brackets (which are personal preference), its exactly how I would have done it.

aznballerlee · Dec 1st, 2006, 12:11 AM

Oops, m_sources, m_nsources are indeclared.
Also this error: left of '->col' must point to class/struct/union/generic type

-'m_nsources' : undeclared identifier
-'m_sources' : undeclared identifier
-error C2227: left of '->col' must point to class/struct/union/generic type
-left of '->row' must point to class/struct/union/generic type
- 'energySourceAt' : modifiers not allowed on nonmember functions

The Dark · Dec 1st, 2006, 12:28 AM

Change

(Toggle Plain Text)

bool energySourceAt(int r, int c) const

to

(Toggle Plain Text)

bool Valley::energySourceAt(int r, int c) const

aznballerlee · Dec 1st, 2006, 12:40 AM

Alright, I get the change. My next step is not working, I try to build on an idea, now that I have energySourceAt working.

The following fills the grid with dots, and my TODO is to place * at every energy source. Why don't this work?

(Toggle Plain Text)

	// fill the grid with dots
	for (r = 0; r < NROWS; r++)
		for (c = 0; c < NCOLS; c++)
		{
			grid[r][c] = '.';
			if (energySouceAt(r,c))
				grid[r][c] = '*';
		}

The red is an error. I'm saying ' if there's an energy source at (r,c)', then replace that dot with a *.

The Dark · Dec 1st, 2006, 12:43 AM

Quote:

Originally Posted by aznballerlee

Alright, I get the change. My next step is not working, I try to build on an idea, now that I have energySourceAt working.

The following fills the grid with dots, and my TODO is to place * at every energy source. Why don't this work?

(Toggle Plain Text)

	// fill the grid with dots
	for (r = 0; r < NROWS; r++)
		for (c = 0; c < NCOLS; c++)
		{
			grid[r][c] = '.';
			if (energySouceAt(r,c))
				grid[r][c] = '*';
		}

The red is an error. I'm saying ' if there's an energy source at (r,c)', then replace that dot with a *.

Assuming this is in the Valley::display() function, you just need to put an r in
energySourceAt.

aznballerlee · Dec 1st, 2006, 12:49 AM

Oops

But this doesn't compile well either:

(Toggle Plain Text)

//    If as a result of the attempt to move, the robot is at an energy
//       source, it's recharged to the FULL_ENERGY level.

	if (energySourceAt(m_row, m_col))
		m_energy = FULL_ENERGY;

error C3861: 'energySourceAt': identifier not found

This is under the Robot:step()

The Dark · Dec 1st, 2006, 12:52 AM

The energySourceAt method is a method of Valley, so you must call it either from within another Valley method or using -> or . with a valley object.
The robot has a pointer to the Valley it is in in the m_valley member variable.

aznballerlee · Dec 1st, 2006, 1:00 AM

Quote:

The energySourceAt method is a method of Valley

Understood.

Quote:

so you must call it either from within another Valley method or using -> or . with a valley object.

Not this part. I don't know whcih valley object to -> to the energySourceAt.

aznballerlee · Dec 1st, 2006, 1:01 AM

Never mind, how about this:

(Toggle Plain Text)

m_valley -> energySourceAt(m_row, m_col)

:banana:

aznballerlee · Dec 1st, 2006, 3:13 PM

Yeah, that compiles so great!
Just wondering if ..

(Toggle Plain Text)

    Robot* otherRobotAt(Robot* rp) const
//      If there is at least one robot (other than the one rp points to)
//      at the same (r,c) coordinates as the one rp points to, return a
//      pointer to the one of those other robots with the least amount
//      of energy remaining (if there's a tie, any one of the tied robots
//      will do); otherwise, return NULL.
//
	{

	}

would follow the same idea as

(Toggle Plain Text)

bool Valley::energySourceAt(int r, int c) const
{
  for (int k = 0; k < m_nsources; k++)
  {
      if ((m_sources[k]->row()== r) 
       && (m_sources[k]->col()== c))
            return true;
  }
  return false;
}

where we have to check each robot now, at each row and column to see if they match. It true, return .. a this?

Dec 1st, 2006, 12:28 AM	#43
The Dark Expert Programmer Join Date: Jun 2005 Posts: 816 Rep Power: 4	Change (Toggle Plain Text) bool energySourceAt(int r, int c) const bool energySourceAt(int r, int c) const to (Toggle Plain Text) bool Valley::energySourceAt(int r, int c) const bool Valley::energySourceAt(int r, int c) const

Dec 1st, 2006, 12:40 AM	#44
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	Alright, I get the change. My next step is not working, I try to build on an idea, now that I have energySourceAt working. The following fills the grid with dots, and my TODO is to place * at every energy source. Why don't this work? (Toggle Plain Text) // fill the grid with dots for (r = 0; r < NROWS; r++) for (c = 0; c < NCOLS; c++) { grid[r][c] = '.'; if (energySouceAt(r,c)) grid[r][c] = ''; } // fill the grid with dots for (r = 0; r < NROWS; r++) for (c = 0; c < NCOLS; c++) { grid[r][c] = '.'; if (energySouceAt(r,c)) grid[r][c] = ''; } The red is an error. I'm saying ' if there's an energy source at (r,c)', then replace that dot with a *.

Dec 1st, 2006, 12:49 AM	#46
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	Oops But this doesn't compile well either: (Toggle Plain Text) // If as a result of the attempt to move, the robot is at an energy // source, it's recharged to the FULL_ENERGY level. if (energySourceAt(m_row, m_col)) m_energy = FULL_ENERGY; // If as a result of the attempt to move, the robot is at an energy // source, it's recharged to the FULL_ENERGY level. if (energySourceAt(m_row, m_col)) m_energy = FULL_ENERGY; error C3861: 'energySourceAt': identifier not found This is under the Robot:step()

Dec 1st, 2006, 1:01 AM	#49
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	Never mind, how about this: (Toggle Plain Text) m_valley -> energySourceAt(m_row, m_col) m_valley -> energySourceAt(m_row, m_col) :banana:

Dec 1st, 2006, 3:13 PM	#50
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	Yeah, that compiles so great! Just wondering if .. (Toggle Plain Text) Robot* otherRobotAt(Robot* rp) const // If there is at least one robot (other than the one rp points to) // at the same (r,c) coordinates as the one rp points to, return a // pointer to the one of those other robots with the least amount // of energy remaining (if there's a tie, any one of the tied robots // will do); otherwise, return NULL. // { } Robot* otherRobotAt(Robot* rp) const // If there is at least one robot (other than the one rp points to) // at the same (r,c) coordinates as the one rp points to, return a // pointer to the one of those other robots with the least amount // of energy remaining (if there's a tie, any one of the tied robots // will do); otherwise, return NULL. // { } would follow the same idea as (Toggle Plain Text) bool Valley::energySourceAt(int r, int c) const { for (int k = 0; k < m_nsources; k++) { if ((m_sources[k]->row()== r) && (m_sources[k]->col()== c)) return true; } return false; } bool Valley::energySourceAt(int r, int c) const { for (int k = 0; k < m_nsources; k++) { if ((m_sources[k]->row()== r) && (m_sources[k]->col()== c)) return true; } return false; } where we have to check each robot now, at each row and column to see if they match. It true, return .. a this?

Dec 1st, 2006, 12:10 AM	#41
The Dark Expert Programmer Join Date: Jun 2005 Posts: 816 Rep Power: 4	Yep, that looks right, aside from indenting and extra brackets (which are personal preference), its exactly how I would have done it.

Dec 1st, 2006, 12:11 AM	#42
aznballerlee Hobbyist Programmer Join Date: Nov 2006 Posts: 111 Rep Power: 2	Oops, m_sources, m_nsources are indeclared. Also this error: left of '->col' must point to class/struct/union/generic type -'m_nsources' : undeclared identifier -'m_sources' : undeclared identifier -error C2227: left of '->col' must point to class/struct/union/generic type -left of '->row' must point to class/struct/union/generic type - 'energySourceAt' : modifiers not allowed on nonmember functions

Dec 1st, 2006, 12:52 AM	#47
The Dark Expert Programmer Join Date: Jun 2005 Posts: 816 Rep Power: 4	The energySourceAt method is a method of Valley, so you must call it either from within another Valley method or using -> or . with a valley object. The robot has a pointer to the Valley it is in in the m_valley member variable.

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