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139 lines
3.2 KiB
C++
139 lines
3.2 KiB
C++
Quadratic Equation
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#include <math.h>
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#include <iostream>
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using namespace std;
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struct graphPoint{
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double x, y;
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};
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class QuadraticEquation{
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public:
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QuadraticEquation(double A = 0.0, double B = 0.0, double C = 0.0) : a(A), b(B), c(C){
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xintercepts[0].x = 0.0;
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xintercepts[0].y = 0.0;
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xintercepts[1].x = 0.0;
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xintercepts[1].y = 0.0;
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}
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~QuadraticEquation(){}
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int getxintercepts(){
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double temp = (b * b) - (4 * a * c);
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if(temp < 0){
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cout << "##-Square Root Error:\n"
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<< " ##- SquareRoot ( " << temp << " )\n";
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return 1;
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}
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temp = sqrt ( temp );
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xintercepts[0].x = (b * -1) - temp;
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xintercepts[0].x = xintercepts[0].x / (2 * a);
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xintercepts[1].x = (b * -1) + temp;
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xintercepts[1].x = xintercepts[1].x / (2 * a);
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return 0;
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}
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void displayequation(){
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if(a != 0){
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cout << a;
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cout << "x^2";}
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if(b >= 1 & a != 0)
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cout << "+";
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if(b != 0)
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cout << b << "x";
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if(c > 0)
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cout << "+";
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if(c != 0)
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cout << c;
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if(a == 0 & b == 0 & c == 0)
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cout << 0;
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cout << "=0" << endl;
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}
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double a, b, c;
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graphPoint xintercepts[2];
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};
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void creditsHelp();
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void wierdGetch();
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int main(int argc, char *argv[]){
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cout << "@-Quadratic Equation Solver\n"
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<< " @-Karlan Mitchell karlanmitchell-at-comcast-dot-net\n"
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<< " @-For Credits/Help enter 0 for A\n";
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double a,b,c;
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cout << "Enter in values for equation\n";
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for(;;){
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cout << "A: ";
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cin >> a;
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if(a == 0.0){
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creditsHelp();
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continue;
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}
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break;
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}
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cout << "B: ";
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cin >> b;
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cout << "C: ";
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cin >> c;
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QuadraticEquation test(a,b,c);//create the class
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test.displayequation();//display the equation with the class function
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switch(test.getxintercepts()){/* I am using a switch here instead of
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* an if because I constanly add/remove
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* error messages to this function*/
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case 1:
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cout << "!!-Equation not possible\n"
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<< " !!-If you know that it is possible, please contact me about a bug\n";
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exit(1);
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break;
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}
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cout << "x = " << test.xintercepts[0].x << " | " << test.xintercepts[1].x << endl;
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cout << "(" << test.xintercepts[0].x << ", 0) & (" << test.xintercepts[1].x << ", 0)\n";
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wierdGetch();
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return 0;
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}
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void creditsHelp(){
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cout << "\nThis program was created by me to make my math homework easier\n\n"
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<< "What it does:\n"
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<< "It takes in the 'a', 'b', and 'c' values for a quadratic equation\n"
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<< "which equals zero.\n"
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<< "EX: \"x^2 - 3x + 2 = 0\" is equal to \"(x - 2)(x - 1) = 0\"\n"
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<< " ax^2 + bx + c = 0\n"
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<< " The 'a','b', and 'c' values for the equation would be 1, -3, and 2\n"
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<< " The x intercepts for this would be (2, 0) and (1, 0)\n"
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<< " 2^2 - 3(2) + 2 = 0 and 1^2 - 3(1) + 2 = 0\n\n"
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<< "Why would I use this:\n"
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<< "1) You are in Algebra I/II or Geometry\n"
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<< "2) Your too lazy to do the quadratic equation on your own which is:\n"
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<< " x=( -b +/- sqrt(bb - 4ac) ) / (2a)\n";
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wierdGetch();
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exit(0);
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}
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void wierdGetch(){
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cout << "Press enter to exit...";
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getchar();getchar();//Why do I need, two? The world may never know
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}
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