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# 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); }
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