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how to post a 1 digit for this program

lloydi21345 (3)
Hi, i really don't know what to do guys can you help me with this code for my matrix program? this program is not yet finished and i am stuck with this problem

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#include <iostream>
#include <math.h>

using namespace std;

int main()
{
int rotx, roty, rotz, n, ac1, ac2, ac3, ac4, atransx, atransy, atransz;
double axx1, ayx1, azx1, axy1, ayy1, azy1, axz1, ayz1, azz1;
int transx=0;
int transy=0;
int transz=0;
int c1=0;
int c2=0;
int c3=0;
int c4=1;
int counter;
int count=0;
char command;
Start:
float xx1 = 0;
float yx1 = 0;
float zx1 = 0;
float xy1 = 0;
float yy1 = 0;
float zy1 = 0;
float xz1 = 0;
float yz1 = 0;
float zz1 = 0;

cout<<"Choose a command (Maximum of 3 Operations):"<<endl;
cout<<"[1] Rotate X"<<endl<<"[2] Rotate Y"<<endl<<"[3] Rotate Z"<<endl<<"[4] Add Transformation"<<endl<<"[6] Calculate"<<endl<<"[7] Quit"<<endl<<"Choice: ";
cin>>n;

switch (n){
case 1:
cout <<"Rotate X at angle: "<<endl;
cin >> rotx;
xx1 = sin (rotx*3.14/180);
yx1 = cos (rotx*3.14/180);
zx1 = cos (rotx*3.14/180);
xy1 = cos (rotx*3.14/180);
yy1 = cos (rotx*3.14/180);
zy1 = sin (rotx*3.14/180);
xz1 = cos (rotx*3.14/180);
yz1 = -sin (rotx*3.14/180);
zz1 = cos (rotx*3.14/180);
count=count+1;
cout<<"Angle included"<<endl<<endl;
goto Input;
break;


case 2:
cout<<"Rotate Y at angle: "<<endl;
cin >> roty;
xx1 = cos (roty*3.14/180);
yx1 = cos (roty*3.14/180);
zx1 = -sin (roty*3.14/180);
xy1 = cos (roty*3.14/180);
yy1 = sin (roty*3.14/180);
zy1 = cos (roty*3.14/180);
xz1 = sin (roty*3.14/180);
yz1 = cos (roty*3.14/180);
zz1 = cos (roty*3.14/180);
count++;
cout<<"Angle included"<<endl<<endl;
goto Input;
break;

case 3:
cout <<"Rotate Z at angle: "<<endl;
cin >> rotz;
xx1 = cos (rotz*3.14/180);
yx1 = sin (rotz*3.14/180);
zx1 = cos (rotz*3.14/180);
xy1 = -sin (rotz*3.14/180);
yy1 = cos (rotz*3.14/180);
zy1 = cos (rotz*3.14/180);
xz1 = cos (rotz*3.14/180);
yz1 = cos (rotz*3.14/180);
zz1 = sin (rotz*3.14/180);
count++;
cout<<"Angle included"<<endl<<endl;
goto Input;
break;
} //end of cases

Input:
if (count==1)
{
axx1=xx1;
ayx1=yx1;
azx1=zx1;
ac1=c1;
axy1=xy1;
ayy1=yy1;
azy1=zy1;
ac2=c2;
axz1=xz1;
ayz1=yz1;
azz1=zz1;
ac3=c3;
atransx=transx;
atransy=transy;
atransz=transz;
ac4=c4;

cout<<"Your Translation is:"<<endl<<endl;
cout<<" "<<axx1<<" "<<axy1<<" "<<axz1<<" "<<atransx<<" "<<endl;
cout<<" "<<ayx1<<" "<<ayy1<<" "<<ayz1<<" "<<atransy<<" "<<endl;
cout<<" "<<azx1<<" "<<azy1<<" "<<azz1<<" "<<atransz<<" "<<endl;
cout<<" "<<ac1<<" "<<ac2<<" "<<ac3<<" "<<ac4<<" "<<endl<<endl<<endl;
goto Start;
}
else

return 0;
}


output:
1 0.000796327 0.000796327 0
0.000796327 0.000796327 -1 0
0.000796327 1 0.000796327 0
0 0 0 1

output should be:
1 0 0 0
0 0 -1 0
0 1 0 0
0 0 0 1

any idea how can i have this??? thanks a lot
Last edited on
R0mai (730)
Rounding error.
Floating point operations don't give exact results, usually just a very close result due to rounding errors.
Even if they would be exact, then the fact that you use PI to only 2 decimals will give incorrect results.
cmccmc (103)
replace all your float's with double's. Floats math isn't exact
DrakeMagi (85)
you are not going to get 1 digits with floats or double.

your floats are fine.
your Pi is off.
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#include <iostream>
#include <cmath>

using namespace std;
 
const float Pi = 4.0 * atan(1.0); // 3.14159

class Obj
{
  public:
	float x , y;
	short Ang;
	
	Obj( short aAng )
	{ Ang = aAng; }
	
	void Round( string txt )
	{
		if ( x > -0.0000001 && x < 0.0000001 ) { x = 0; }
		if ( y > -0.0000001 && y < 0.0000001 ) { y = 0; }
		cout << txt << x << " : " << y << endl;
	}
};

void Rotate(Obj& o)
{
	o.x = sin( o.Ang * Pi / 180 );
	o.y = cos( o.Ang * Pi / 180 );
}

int main()
{
	Obj Myo( 0 );
	Rotate( Myo );
	Myo.Round( "Angle 0   : ");
	
	Myo.Ang = 45;
	Rotate( Myo );
	Myo.Round( "Angle 45  : ");
	
	Myo.Ang = 90;
	Rotate( Myo );
	Myo.Round( "Angle 90  : ");
	
	Myo.Ang = 180;
	Rotate( Myo );
	Myo.Round( "Angle 180 : ");

	Myo.Ang = 270;
	Rotate( Myo );
	Myo.Round( "Angle 270 : ");
	
	cout << 4.0 * atan(1.0) << endl;
	
	return 0;
}



lloydi21345 (3)
hi r0mai, cmccmc and drakemagi for the reply.. now im trying to changed totally everything from float to double. Very great one drakemagi for the code effort.

although i still don't understand the part of your program.

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class Obj{
Obj( short aAng )
	{ Ang = aAng; }
	
	void Round( string txt )
	{
}
}


but i know the code u have given to me is for rounding off, i think i need to hang more with c++ to know more about those keywords
DrakeMagi (85)
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class Obj     // self define object
{
    Obj( short aAng )    // Constructor , an auto build
    { Ang = aAng; }
	
    void Round( string txt )  // a function/method  . That belong to the class.
    { ... }
}


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#include <iostream>
#include <cmath>
#include <string>

using namespace std;

const float Pi = 4.0 * atan(1.0); // 3.14159

// a class is a self define object
class xyz
{
  public: // made public for outside access
	float x , y, z;
	
	xyz() { x = 0; y = 0; z = 0; } // constructor
	
	// void clear() is just a function . void means no return item
	void clear() { x = 0; y = 0; z = 0; } // a function of xyz
};

class myobject
{
  public:
	xyz x, y, z, rot, atrans;
	
	void clear() // a function of myobject
	{ x.clear(); y.clear(); z.clear(); rot.clear(); atrans.clear();}
	
	// all round does is take low numbers and set it to 0
	// numbers like -4.37114e-08
	float Round ( float f ) // a function of myobject class
	{
                // comment if block out to see really small float
		if ( f > -0.0000001 && f < 0.0000001 ) { f = 0; }
		return f;
	}
	
	void Rotate( short n ) // a function of myobject class
	{
		switch(n)
		{
			case 1:
			{
				cout <<"Rotate X at angle: ";
				cin >> rot.x;
				x.x = Round( sin (rot.x*Pi/180.0) );
				y.x = Round( cos (rot.x*Pi/180.0) );
				z.x = Round( cos (rot.x*Pi/180.0) );
				x.y = Round( cos (rot.x*Pi/180.0) );
				y.y = Round( cos (rot.x*Pi/180.0) );
				z.y = Round( sin (rot.x*Pi/180.0) );
				x.z = Round( cos (rot.x*Pi/180.0) );
				y.z = Round( -sin (rot.x*Pi/180.0) );
				z.z = Round( cos (rot.x*Pi/180.0) );
				cout<<"Angle included"<<endl<<endl;
				break;
			}
			case 2:
			{
				cout <<"Rotate Y at angle: ";
				cin >> rot.y;
				x.x = Round( cos (rot.y*Pi/180.0) );
				y.x = Round( cos (rot.y*Pi/180.0) );
				z.x = Round( -sin (rot.y*Pi/180.0) );
				x.y = Round( cos (rot.y*Pi/180.0) );
				y.y = Round( sin (rot.y*Pi/180.0) );
				z.y = Round( cos (rot.y*Pi/180.0) );
				x.z = Round( sin (rot.y*Pi/180.0) );
				y.z = Round( cos (rot.y*Pi/180.0) );
				z.z = Round( cos (rot.y*Pi/180.0) );
				cout<<"Angle included"<<endl<<endl;
				break;
			}
			case 3:
			{
				cout <<"Rotate Z at angle: ";
				cin >> rot.z;
				x.x = Round( cos (rot.z*Pi/180.0) );
				y.x = Round( sin (rot.z*Pi/180.0) );
				z.x = Round( cos (rot.z*Pi/180.0) );
				x.y = Round( -sin (rot.z*Pi/180.0) );
				y.y = Round( cos (rot.z*Pi/180.0) );
				z.y = Round( cos (rot.z*Pi/180.0) );
				x.z = Round( cos (rot.z*Pi/180.0) );
				y.z = Round( cos (rot.z*Pi/180.0) );
				z.z = Round( sin (rot.z*Pi/180.0) );
				cout<<"Angle included"<<endl<<endl;
				break;
			}
			default:
			{
				break;
			}
		}
	}
	
	void Print()
	{
		string space = "       ";
		cout << endl <<" Your Translation is:" << endl;
		cout << space << x.x << " " << x.y << " " << x.z << " " << atrans.x << endl;
		cout << space << y.x << " " << y.y << " " << y.z << " " << atrans.y << endl;
		cout << space << z.x << " " << z.y << " " << z.z << " " << atrans.z << endl;
		cout << endl;
	}
};

int main()
{
	myobject obj;
	int n;
	bool run = true;
	
	while (run)
	{
		cout << "  (1) Rotate X" << endl; 
		cout << "  (2) Rotate Y" << endl;
		cout << "  (3) Rotate Z" << endl;
		cout << "  (10) Reset" << endl;
		cout << "  (11) Result" << endl;
		cout << "  (12) Quit" << endl;
		cout << endl << "Choice :: ";
		cin >> n;
		
		if ( n < 9 ) { obj.Rotate( n ); }
		else if (n == 10) { obj.clear(); }
		else if (n == 11) { obj.Print(); }
		else if (n == 12) { run = false; }	
	}
	
	return 0;
}
Last edited on
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