Thread: How to convert angle degrees into radians

Guys...I was adding more parts to that equation solver program to make it a calculator of sorts...I need to know how to change degrees into radians..some help please?

Its the same one I used o.O damn I made a mistake

It isn't working...Let me post the problem -:

This is the first part.

Code:

class Program
{
       private:
               float a,x,b,c,D,d,f; //Teh math vars.
               int n; //You guessed it....ANOTHER math variable.
               long double radians, degrees, Sine, Tangent, Cosine, Arctan, Arcsine, Arccos; //Trigonometry.
               char g[1]; //For the trigo section.
                                                          
       public:
               void Case1(); //All of
               void Case2(); //these
               void Case3(); //are
               void Case4(); //the 
               void Case5(); //mathematical
               void Case6(); //operations.
               void Trigonometry();// Trigonometrics. 
               void EXIT();  //The exit function.
               void RorQ();  //The restart or quit function.
               int exit;     //The exit value.
               int exitRorQ; //The restart or quit value.
               char rq[1];   // "r" or "q"?(char size 1)
                             
};

The Trigonometrics Part

Code:

void Program::Trigonometry()
{
                    double pi = 3.1416; //Again for trigo.
                    if (g == "M")
                     {
                           setcolor(7);
                           cout << "Enter angle theta (degrees) -";
                           cin >> degrees;
                           a = (degrees * pi)/180;
                           Sine = sin (a);
                           Cosine = cos (a);
                           Tangent = tan (a);
                           Arctan = atan (a);
                           Arccos = acos (a);
                           Arcsine = asin (a);
                           cout << "\nThe trigonometric ratiosare as follows -:\n";
                           setcolor(14);
                           cout << "Sin theta = " << Sine << endl;
                           cout << "Cos theta = " << Cosine << endl;
                           cout << "Tan theta = " << Tangent << endl;
                           cout << "Inverse Sin(Arcsine) theta = " << Arcsine << endl;
                           cout << "Inverse Cos(Arccos) theta = " << Arccos << endl;
                           cout << "Inverse Tan(Arctan) theta = " << Arctan << endl;
                     }
                     else if (g == "N")
                     { 
                           setcolor(7);
                           cout << "Enter angle theta(radians) -";
                           cin >> radians;
                           a == radians;
                           Sine = sin (a);
                           Cosine = cos (a);
                           Tangent = tan (a);
                           Arctan = atan (a);
                           Arccos = acos (a);
                           Arcsine = asin (a);
                           cout << "\nThe trigonometric ratiosare as follows -:\n";
                           setcolor(14);
                           cout << "Sin theta = " << Sine << endl;
                           cout << "Cos theta = " << Cosine << endl;
                           cout << "Tan theta = " << Tangent << endl;
                           cout << "Inverse Sin(Arcsine) theta = " << Arcsine << endl;
                           cout << "Inverse Cos(Arccos) theta = " << Arccos << endl;
                           cout << "Inverse Tan(Arctan) theta = " << Arctan << endl;
                     }
}

And the Case6 part

Code:

void Program::Case6()
{
                     cout << "Enter angle in (M)degrees or (N)radians? - ";
                     cin >> g;
                     Trigonometry();
                     setcolor(7);
                     Sleep(3000);
}

The output after cout << "Enter angle"..... isn't coming..it just skips the if else statements and goes straight to the getch(); in main..

You could declare the multiplier as a constant:

Code:

const DEG_TO_RAD 0.0174532925;

Then use call it in you program like:

Code:

radians = degrees * DEG_TO_RAD;

It saves some extra calculations.

where exactly must I implement that code? In the main()?

Code:

int main() //Muhuhahahhahaha
{
     Program OMGDOIT; 
     int y;
     C.exit = 1;
     int ch;          //Clearing input buffers.
     char buf[BUFSIZ];//Same.
     while(C.exit == 1)
     {
    
        cout << "\nWelcome to the Equation Solver!\n";
        cout << "\nChoose one of the following -:\n";         
        cout << "\n1. Find a quadratic equation's nature of roots\n";
        cout << "\n2. Find a quadratic equation's roots\n";
        cout << "\n3. Establish the Viète relation of the roots and coefficients\n";
        cout << "\n4. Find a term of an arithmetic progression(AP)\n";
        cout << "\n5. Find the sum of the terms of an AP\n";
        cout << "\n6. Find the trigonometric values of an angle\n";
        cout << "\n7. Quit,noobs >_>\n";
        cin >> y;
        cin.ignore();
        
        switch(y)
        {         
                  case 1:
                      OMGDOIT.Case1();
                      getch();
                      OMGDOIT.RorQ();
                      break;
                  case 2:
                      OMGDOIT.Case2();
                      getch();
                      OMGDOIT.RorQ();
                      break;
                  case 3:
                      OMGDOIT.Case3();
                      getch();
                      OMGDOIT.RorQ();
                      break;
                  case 4: 
                      OMGDOIT.Case4();
                      getch();
                      OMGDOIT.RorQ();
                      break;
                  case 5:
                      OMGDOIT.Case5(); 
                      getch();
                      OMGDOIT.RorQ();
                      break;  
                  case 6:
                      cout.flush(); 
                      OMGDOIT.Case6();
                      getch();
                      OMGDOIT.RorQ();
                      break; 
                  case 7:
                       C.exit = 0;  
                       break;  
                  default: 
                      cout << "Enter a number in the list\n";
                      break;
        }
        clrscr(); //Clears screen maybe?
        }
              
        return 0;
}

The trig functions take arguments in radians. You've correctly converted a from degrees to radians, then incorrectly converted it right back to degrees inside the arguments to each of the trig functions.

I was thinking pretty much the same thing...it accepts arguements in radians. How do I make it accept args in degrees? Then I'd convert degrees to radians,feed it to the computer and get an output based on that. And Salem that if else works anyway :P

Hmm k I see,I'll implement what you said...but what about the accepting args in degrees part..some help on that please