#include #include #include using namespace std; class wind { public: wind(float x, float y, int z) : vs(x), aws(y), awd(z) { } /* Calculating true wind speed vs - vessel's speed, aws - apparent wind speed, awd - apparent wind direction, tws - true wind speed, rwd - true relative wind direction */ float windSpeed (float vs, float aws, int awd) { float tws; //tws - true wind speed tws=sqrt(pow(vs,2)+pow(aws,2)-(2*vs*aws*cos(awd*0.0175))); return tws; } /* Calculating true relative wind direction vs - vessel's speed, aws - apparent wind speed, awd - apparent wind direction, tws - true wind speed, rwd - true relative wind direction */ float windDir (float vs, float aws, float tws) { float rwd; //rwd - apparent (relative) wind direction rwd=acos((pow(aws,2)-pow(tws,2)-pow(vs,2))/(2*tws*vs))/0.0175; return rwd; } private: float vs; float aws; int awd; }; // Setting precision: one digit after the point void twodigits(float x) { if (x>99) { cout<9) { cout<0) { cout<>vs; cout<<"Enter vessel's heading (0-360 degr) - "; cin>>vh; cout<>aws; cout<>awd; cout<>awds; if (awds=='P') { k=-1; } else if (awds=='S') { k=1; } else { cout<<"Wrong relative wind direction side input!"; } wind ws(vs,aws,awd); rws=ws.windSpeed(vs,aws,awd); rwd=round(ws.windDir(vs,aws,rws)); twd=vh+k*rwd; if (twd<0) { twd=twd+360; } else if (twd>360) { twd=twd-360; } cout<<"True wind speed is "; twodigits(rws); cout<<" knots"<

True wind calculator