Practice program

[bowlbase]

I'm trying to create a program that can help me with some statics problems I've been doing.

I have it set up to where I input the coordinates for each important point and do fine until it comes time to get me total forces in x,y,z. I think this has something to do with the need to divide in order to get my unit vectors. Here is my problem area:

double AB, AC, AD;
				AB = (pow(Bx - Ax, 2) + pow(By - Ay, 2) + pow(Bz - Az, 2));
				AC = (pow(Cx - Ax, 2) + pow(Cy - Ay, 2) + pow(Cz - Az, 2));
				AD = (pow(Dx - Ax, 2) + pow(Dy - Ay, 2) + pow(Cz - Az, 2));

				cout << "These are the magnitudes of each vector from A;\n";

				double FBx, FBy, FBz, FCx, FCy, FCz, FDx, FDy, FDz;
				cout << pow(AB, .5) << '\t' << pow(AC, .5) << '\t' << pow(AD, .5) << endl;
				FBx = FB * (Bx / AB);
				FBy = FB * (By / AB);
				FBz = FB * (Bz / AB);
				FCx = FC * (Cx / AC);
				FCy = FC * (Cy / AC);
				FCz = FC * (Cz / AC);
				FDx = FD * (Dx / AD);
				FDy = FD * (Dy / AD);
				FDz = FD * (Dz / AD);
				cout << FB << FBy << endl;
				
				double Fx, Fy, Fz;
				Fx = FBx + FCx + FDx;
				Fy = FBy + FCy + FDy;
				Fz = FBz + FCz + FDz;
				
				cout << "Sum of the vectors:\n";
					cout << Fx << '\t' << Fy << '\t' << Fz << endl;
				double magVtotal;
				magVtotal = pow(Fx, 2) + pow(Fy, 2) + pow(Fz, 2);
				cout << "The total magnitude of these vectors:" << pow(magVtotal, .5) << endl;

My guess is that my problem starts here: FBx = FB * (Bx / AB); Notably the Bx / AB. These are always going to be less than one. Since I use these variables in my pow function and as division here I'm not totally sure what to declare them as. Any help would be appreciated!

[Aceix]

What is the value of Bx, is it initialized

[bowlbase]

user has to input the value of each coordinate. For the example I'm working off of though it is 0.

[bowlbase]

I fixed it. I had a small mistake in variable placement. Program can do statics problems with antenna attached to 3 cables. Now i just need to find a way to make more general and for 'n' cables.