# include <iostream>
# include <math.h>
# include <cstdlib>
using namespace std;

double cosin_value( double value);
double sin_value( double value);
double big_degree (double value);
double big_radian (double value);
double x;
double value;
double degree;
double radian;
const double PI = 3.14159;

char choice;
char yes ;

int main()
{
	bool end = false; 
	
	while (!end) //user requested to repeat the program
	{
		cout << "******** Trigonometric Program ********" << endl;
		cout << "Please enter an angle value => ";
		cin >> value; //request user to input a value
		
		bool valid_choice = false;
		while(!valid_choice)
		{
		
			cout << "Is the angle in Degree or Radian?" << endl;
			cout << "\t" << "Type D if it is in Degree" << endl;
			cout << "\t" << "Type R if it is in Radian" << endl;
			cout << "Your response => ";
			cin >> choice; //degree or radian?
	
			cout.setf(ios::fixed);
			cout.setf(ios::showpoint);
			cout.precision(10);
		
			if (choice == 'D' || choice == 'd')
			{
				degree = (value*PI)/180;
				cout << value << " " << "Degree      = " << degree << " " << "Radian" ;
				valid_choice = true;
			}
	
			else if (choice == 'R' || choice == 'r')
			{
				big_radian (value);
				valid_choice = true;
			}
		
			else
			{ 
				cout << "Invalid choice!"<< "Please select again =) " << endl;
				valid_choice = false;
			}
			cout << endl;
		}		
	
		cout << endl;
		cout << endl;
		cout << "\t" << "\t" << "Results" << endl;
		cout << "========================================" << endl; //interface
		if (choice == 'D' || choice == 'd')
		{
			cout << "     "<< "x    = " << "\t" << "" << degree << " " << "Radian" << endl;
		}
		
		else if (choice == 'R' || choice == 'r')
		{
		cout << "     "<< "x    = " << "\t" << "" << radian << " " << "Radian" << endl;
		}
		
		if (choice == 'D' || choice == 'd')
		{
			big_degree (value);
			cout << " " << "sin(x)   = " << "\t" << sin_value(degree) << endl;
			cout << " " << "cos(x)   = " << "\t" << cosin_value(degree) << endl;
			cout << " " << "tan(x)   = " << "\t" << sin_value(degree)/cosin_value(degree) << endl;
		}
		else if (choice == 'R' || choice == 'r')
		{	
			cout << " " << "sin(x)   = " << "\t" << sin_value(radian) << endl;
			cout << " " << "cos(x)   = " << "\t" << cosin_value(radian) << endl;
			cout << " " << "tan(x)   = " << "\t" << sin_value(radian)/cosin_value(radian) << endl;
		}	
		cout << "========================================" << endl;
	
		system("pause");
		cout << "Do you want to continue?" <<endl;
		cout << "\t" << "Type Y to continue" << endl;
		cout << "\t" << "Type any other key to stop" << endl;
		cout << "Your Response => " ;
		cin >> yes;
		if (yes == 'Y' || yes == 'y')
		{
			end = false;
		}	
		
		else
		{
			end = true;
			cout << "Thanks you, good bye!!" << endl;
		}	
		cout << endl;
	}	
	return 0;
}	

// Sine,cosine functions
// angle -360<value<360

double sin_value( double value)
{
	int count=1;
	
	double sine, num, dem, sign, term;
	sine=0;
	sign = 1;	
	num = value;
	dem = count;
	
	while ( count <= 20 )
	{
		term = (num/dem);
		sine = sine + term*sign;
		num = num*value*value;
		count = count + 2;
		dem = dem * count * (count-1);
		sign = -sign;
		
	}
return (sine);	
}	

double cosin_value( double value)
{
	int count=0;
	double cosine, num, dem, sign, term;
	cosine=0;
	sign = 1;
	
	num = 1;
	dem = 1;
	
	while ( count <= 20 )
	{
		term = (num/dem);
		cosine = cosine + term*sign;
		num = num*value*value;
		count = count + 2;
		dem = dem * count * (count-1);
		sign = -sign;
	}
	return (cosine);
}	

double big_degree (double value)
{
	int result;
	const int angle=360;
	if (value >= 360 || value <= -360)
	{
		result=value/angle;
		degree=(value-(result* angle))*PI/180;
	}	 
	else
	{
		degree = (value*PI)/180;
	}	
	return (degree);
}	

double big_radian (double value)
{
	int result;
	
	if (value >= 2*PI || value <= -2*PI)
	{
		result=value/(2*PI);
		radian=(value-(result* 2*PI));
	}	 
	else
	{
		radian = value;
	}	
	return (radian);
}	

cc1plus: warnings being treated as errors
In function 'double big_degree(double)':
Line 168: warning: converting to 'int' from 'double'
In function 'double big_radian(double)':
Line 184: warning: converting to 'int' from 'double'