School Stuff 09

//Function with output parameters
//Add two vectors that are at right angles to each other

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

using namespace std;

const double PI=3.14159265358979;

void addVect (double&,int&,double,double); //use shorter format of prototype

int main()
{
    double aVect;
    double bVect;
    double rMag;
    int rDir;

    cout<<"Enter the magnitude of the horizontal vector A : ";
    cin>>aVect;

    cout<<"Enter the magnitude of the vertical vector B : ";
    cin>>bVect;

    addVect(rMag,rDir,aVect,bVect);

    cout<<setiosflags(ios::fixed)<<setprecision(1);

    cout<<"A + B yields resultant vector of magnitude "<<rMag<<endl<<"and direction "<<rDir<<" degrees"<<endl;

    return 0;
}

//
//Add vectors a and b that are at right angles
//a is horizontal, b is vertical, a>0, b>0
//Express direction of resultant in whole degrees,
//
    void addVect(double& rMagnitude, //output-magnitude of resultant
                 int& rDirection, //output - direction of resultant in whole degrees
                 double a, double b) //input - vectors at right angles
{
    double rDirRadians; //direction of resultant in radians

    rMagnitude = sqrt(a*b+b*b);
    rDirRadians = atan(b/a);
    rDirection = int (180/PI*rDirRadians+0.5);
}