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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
ofstream fout;
ifstream fin;
void printIdInfo(ostream &);
void readData(double &, double &, double &);
void printInvalidMsg();
void printEquilateralMsg();
double areaEquilateral(double);
double perimeterTriangle(double, double, double);
double areaTriangle (double side1, double side2, double side3);
void printResults( ostream & , double, double, double, double, double);
int main()
{
double side1,
side2,
side3,
equTriArea,
tri_area,
tri_perim;
fin.open("prog5_inp5.txt");
fout.open("prog5_out5.txt");
do
{
printIdInfo(cout);
printIdInfo(fout);
readData(side1, side2, side3);
if ( side1 <= 0 || side2 <= 0 || side3 <= 0)
printInvalidMsg();
else
{
if ( side1 == side2 && side1 == side3 )
{
printEquilateralMsg();
tri_area= areaEquilateral(side1);
tri_perim= perimeterTriangle(side1, side2, side3);
printResults(fout, side1, side2, side3, tri_area,
tri_perim);
}
else
{
tri_area= areaTriangle (side1, side2, side3);
tri_perim= perimeterTriangle(side1, side2, side3);
printResults(fout, side1, side2, side3, tri_area,
tri_perim);
}
}
}
while ( side1 <= 0 || side2 <= 0 || side3 <= 0);
return 0;
}
void printIdInfo(ostream &out)
{
out << "Jacob Hummer, Matthew Grant" << endl
<< "C.S. 1428.0005" << endl
<< "11/12/09" << endl;
}
void readData(double &side1, double &side2, double &side3)
{
fin.open("triangle_sides.txt");
fin >> side1 >> side2 >> side3;
}
void printInvalidMsg ()
{
cout << "There were no valid input values on the input file.";
}
void printEquilateralMsg()
{
fout <<"The Triangle is Equilateral " <<endl;
}
double areaEquilateral( double side1 )
{
return ( pow(side1,2) * sqrt(3)) / 4.0;
}
double perimeterTriangle(double side1, double side2, double side3)
{
return side1+side2+side3;
}
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 ) );
void printResults (double side1, double side2, double side3, double area,
double tri_perim, ostream &out)
{
printIdInfo(fout);
fout <<endl
<<"The sides of the triangle are " <<side1 <<", " <<side2
<<", and " <<side3 <<"." <<endl
<<"The area of the triangle is " <<area <<". \n"
<<"The perimeter of the triangle is " << tri_perim
<< endl << endl;
}
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