//**************************************
//     
// Name: Trig Calculator
// Description:The code calculates the v
//     alues of the basic trigonometric functio
//     ns: sine, cosine, tangent, cosecant, sec
//     ant, cotangent.
// By: Luchezar Abbott
//
// Inputs:The arguments (variables) for 
//     the functions and integers used for sele
//     cting an option
//
// Returns:The values of the trig functi
//     ons
//
// Side Effects:Inputing characters when
//     asked for numbers. It usually starts loo
//     ping everything or freezes the program
//
//This code is copyrighted and has// limited warranties.Please see http://
//     www.Planet-Source-Code.com/xq/ASP/txtCod
//     eId.3327/lngWId.3/qx/vb/scripts/ShowCode
//     .htm//for details.//**************************************
//     

// TRIG CALCULATOR
//Calculates the values of trigonometric
//     functions
//By Luchezar Abbott
//If you want to use any parts of this c
//     ode, please e-mail me at lucho33@juno.co
//     m with an explanation 
#include <iostream.h>
#include <math.h>
#define PI 3.141592654
void sine (double x)
    { 
    	double sine_result;
    sine_result= sin (x);
    cout<<sine_result<<'\n';
}

void cosine (double x)
    { 
    	double cosine_result;
    cosine_result= cos (x);
    cout<<cosine_result<<'\n';
}

void tangent (double x)
    { 
    	double tangent_result;
    tangent_result= tan (x);
    cout<<tangent_result<<'\n';
}

void cosecant (double x)
    { 
    	double csc_result;
    csc_result= 1/(sin (x));
    cout<<csc_result<<'\n';
}

void secant (double x)
    { 
    	double secant_result;
    secant_result= 1/(cos (x));
    cout<<secant_result<<'\n';
}

void cotangent (double x)
    { 
    	double cot_result;
    cot_result= sin (x);
    cout<<cot_result<<'\n';
}


    void radians (){
    	 int rad_function;
    	 double x;
    	 cout<<"Enter your argument (in radians): \t";
    	 cin>>x;
    	 cout<<"Select one of the following functions: \n";
    	 cout<<"\t 1. SINE \n";
    	 cout<<"\t 2. COSINE \n";
    	 cout<<"\t 3. TANGENT \n";
    	 cout<<"\t 4. COSECANT \n";
    	 cout<<"\t 5. SECANT \n";
    	 cout<<"\t 6. COTANGENT \n";
    	 cin>>rad_function;
        	 switch (rad_function) {
        	 case 1:
        		 sine(x);
        		 break;
        	 case 2:
        		 cosine(x);
        		 break;
        	 case 3:
        		 tangent(x);
        		 break;
        	 case 4:
        		 cosecant(x);
        		 break;
        	 case 5:
        		 secant(x);
        		 break;
        	 case 6:
        		 cotangent(x);
        		 break;
        	 default:
        		 cout<<"INVALID FUCTION: Go back to the list and select a valid function. \n";
        	 } 
        	 }
            void degrees (){
            	 int deg_function;
            	 double deg_arg;
            	 double x;
            	 cout<<"Select one of the following functions: \n";
            	 cout<<"\t 1. SINE \n";
            	 cout<<"\t 2. COSINE \n";
            	 cout<<"\t 3. TANGENT \n";
            	 cout<<"\t 4. COSECANT \n";
            	 cout<<"\t 5. SECANT \n";
            	 cout<<"\t 6. COTANGENT \n";
            	 cin>>deg_function;
                	 	 switch (deg_function) {
                	 case 1:
                		 sine(x);
                		 break;
                	 case 2:
                		 cosine(x);
                		 break;
                	 case 3:
                		 tangent(x);
                		 break;
                	 case 4:
                		 cosecant(x);
                		 break;
                	 case 5:
                		 secant(x);
                		 break;
                	 case 6:
                		 cotangent(x);
                		 break;
                	 default:
                		 cout<<"INVALID FUCTION: Go back to the list and select a valid function. \n";
                	 }	 
                		 cout<<"Enter your argument (in degrees is decimal form): \n";
                	 cin>>deg_arg;
                	 x=deg_arg*PI/180;
                	}
                void main()
                    {
                    int mode;
                        do {
                        cout<<"Set your mode: \n";
                        cout<<"\t 1. Radians\n";
                        cout<<"\t 2. Degrees\n";
                        cin>>mode;
                        if (mode==1)
                            {
                            radians();
                        }


                            else if (mode==2){
                            	degrees ();
                        }


                            else {
                            	cout<<"INVALID MODE: Choose 1 or 2! \n";
                        }

                    }while (mode!=1 && mode!=2);

                }