// header files
#include "Console_IO_Utility.h"
#include <math.h>  // for trig functions

// global constants
//const int DEGREES_IN_TRIANGLE = 180;
//const double ANGEL_C_DEG = 90;
const double CONSTANT_PI = 3.141592654;


const int TWO_ENDLINES = 2;
const int TABLE_WIDTH = 32;
const int DATA_NAME_WIDTH = 16;
const int VALUE_WIDTH = 16;

const char TOP_LINE[] = "===================================";
const char THICK_LINE_DIVIDER[] = "|=================================|";
const char THIN_LINE_DIVIDER[] = "|---------------------------------|";


// prototypes
void printTopLine();
void printThickDividerLine();
void printThinDividerLine();


// main program
int main()
   {
   // make title, circle area calculator
   // display header using "="
   // print ENDLINE
     // functions: printString, printEndline(s), printCharacters
  printEndline();
  printString("Circle Area Calculator");
  printEndline();
  printCharacters(22, '=');
  printEndlines(2);
  printString("Enter required information");
  printEndline();

   // initialize variables
   int radiusCircle;
   double areaCircle;

   // gather user input
     // functions: promptForInteger
  radiusCircle = promptForInteger("Enter the radius of the circle: ");

   // conduct computations
     // functions: pow
   areaCircle = CONSTANT_PI * pow(radiusCircle, 2);

   // display results
     // make TABLE
     // functions: printDoubleJustified, printStringJustified, printCharacter,
     // printEndline(s), printThickDividerLine, printThinDividerLine
  printEndlines(3);
  // Top line for data results table
  printThickDividerLine();
  printEndline();
  // Shows the data results table header
  printCharacter(PIPE);
  printCharacter(SPACE);
  printStringJustified("Data Results", TABLE_WIDTH - 1, "CENTER");
  printCharacter(SPACE);
  printCharacter(PIPE);
  printEndline();
  printThinDividerLine();
  printEndline();
  // Shows the first line of the table, the radius of the Circle
  printCharacter(PIPE);
  printCharacter(SPACE);
  printStringJustified("Radius", DATA_NAME_WIDTH - 2, "LEFT");
  printCharacter(SPACE);
  printCharacter(PIPE);
  printCharacter(SPACE);
  printDoubleJustified(radiusCircle, PRECISION, VALUE_WIDTH - 2, "RIGHT");
  printCharacter(SPACE);
  printCharacter(PIPE);
  printEndline();
  printThinDividerLine();
  printEndline();
  // Prints Area Results
  printCharacter(PIPE);
  printCharacter(SPACE);
  printStringJustified("Area", DATA_NAME_WIDTH - 2, "LEFT");
  printCharacter(SPACE);
  printCharacter(PIPE);
  printCharacter(SPACE);
  printDoubleJustified(areaCircle, PRECISION, VALUE_WIDTH - 2, "RIGHT");
  printCharacter(SPACE);
  printCharacter(PIPE);
  printEndline();
  printThinDividerLine();
  printEndlines(2);

   // END program
   printString("End Program");
   printEndline();
   return 0;
   }

// supporting functions

void printThickDividerLine()
   {
    // display thik line divider
         // functions: printString
    printString(THICK_LINE_DIVIDER);
   }

void printThinDividerLine()
   {
    // display thin line divider
         // functions: printString
    printString(THIN_LINE_DIVIDER);
   }

void printTopLine()
   {
      // display top line
         // functions: printString
    printString(TOP_LINE);
   }