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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
double side1,
side2,
side3,
equTriArea,
tri_area,
tri_perim;
ofstream fout;
ifstream fin;
void printIdInfo(ostream &);
void readData();
void printInvalidMsg();
void printEquilateralMsg();
double areaEquilateral(double);
double perimeterTriangle(double, double, double);
double areaTriangle (double side1, double side2, double side3);
void printResults();
int main()
{
fout.open("prog5_out5.txt");
printIdInfo(cout);
printIdInfo(fout);
readData();
if ( side1 <= 0 || side2 <= 0 || side3 <= 0)
printInvalidMsg();
else do
{
readData();
if ( side1 == side2 && side1 == side3 )
{
printEquilateralMsg();
tri_area= areaEquilateral(side1);
tri_perim= perimeterTriangle(side1, side2, side3);
printResults();
}
else
{
tri_area= areaTriangle (side1, side2, side3);
tri_perim= perimeterTriangle(side1, side2, side3);
printResults();
}
readData();
}
while ( side1 >= 0 && side2 >= 0 && side3 >=0 );
system ("PAUSE>NUL");
return 0;
}
/*
Function: printIdInfo
This function prints ID info to the screen
Receives: outfile variable
Constants:none
Returns:nothing
*/
void printIdInfo(ostream &out)
{
out << "Jacob Hummer, Matthew Grant" << endl
<< "C.S. 1428.0005" << endl
<< "11/12/09" << endl;
}
/*
Function:readData
This function reads inputs from a file
Receives: access to sides 1,2 and 3
Constants: none
Returns: nothing
*/
void readData()
{
fin.open("prog5_inp5.txt");
fin >> side1 >> side2 >> side3;
}
/*
Function:printInvalidMsg
This function prints a message if there is a negative number from the file
Receives: nothing
Constants: none
Returns: nothing
*/
void printInvalidMsg ()
{
cout << "There were no valid input values on the input file.";
}
/*
Function:printEquilateralMsg
This function prints a message if the triangle is equilateral
Receives: nothing
Constants: none
Returns: nothing
*/
void printEquilateralMsg()
{
fout <<"The Triangle is Equilateral " <<endl;
}
/*
Function:areaEquilateral
This function calculates the area of equilateral triangles
Receives: side1
Constants: none
Returns: area
*/
double areaEquilateral( double side1 )
{
return ( pow(side1,2) * sqrt(3)) / 4.0;
}
/*
Function:perimeterTriangle
This function calculates the perimeter of the triangle.
Receives: side1, side2, side3
Constants: none
Returns: perimeter
*/
double perimeterTriangle(double side1, double side2, double side3)
{
return side1+side2+side3;
}
/*
Function:areaTriangle
This function calculates the area of the non-equilateral triangle.
Receives: side1, side2, side3
Constants: none
Returns: area
*/
double areaTriangle (double side1, double side2, double side3)
{
double s;
s = perimeterTriangle ( side1, side2, side3 ) / 2.0;
return sqrt( s * ( s - side1 ) * ( s - side2 ) * ( s - side3 ) );
}
/*
Function:areaTriangle
This function calculates the area of the non-equilateral triangle.
Receives: side1, side2, side3, tri_area, tri_perim, and outfile variable
Constants: none
Returns: nothing
*/
void printResults ()
{
fout <<endl
<<"The sides of the triangle are " << side1 <<", " << side2
<<", and " << side3 <<"." <<endl
<<"The area of the triangle is " << tri_area <<". \n"
<<"The perimeter of the triangle is " << tri_perim
<< endl << endl;
}
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