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@gxespino
Created Feb 4, 2019
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#include <iostream>
#include <cmath>
using namespace std;
class QuadraticCalculator {
public:
string numberOfSolutions();
void printSolutions();
QuadraticCalculator(double, double, double);
private:
/* Quotients */
double a;
double b;
double c;
double discriminant();
bool hasInfinitySolutions();
bool hasNoSolution();
bool hasNoRealSolution();
bool hasOneSolution();
bool hasTwoSolutions();
};
QuadraticCalculator::QuadraticCalculator(double varA, double varB, double varC) {
a = varA;
b = varB;
c = varC;
}
double QuadraticCalculator::discriminant() {
return (b*b) - (4*(a*c));
}
bool QuadraticCalculator::hasInfinitySolutions() {
return (a == 0) && (b == 0) && (c == 0);
}
bool QuadraticCalculator::hasNoSolution() {
return (a == 0) && (b == 0) && (c != 0);
}
bool QuadraticCalculator::hasNoRealSolution() {
return (discriminant() < 0);
}
bool QuadraticCalculator::hasOneSolution() {
return (discriminant() == 0);
}
bool QuadraticCalculator::hasTwoSolutions() {
return (discriminant() > 0);
}
string QuadraticCalculator::numberOfSolutions() {
const string INFINITE_SOLUTIONS = "an infinite number of solutions";
const string NO_SOLUTION = "no solution";
const string NO_REAL_SOLUTION = "no real solution";
const string ONE_SOLUTION = "a single real solution";
const string TWO_SOLUTIONS = "two real solutions";
string result;
if (hasInfinitySolutions()) {
result = INFINITE_SOLUTIONS;
} else if (hasNoSolution()) {
result = NO_SOLUTION;
} else if (hasNoRealSolution()) {
result = NO_REAL_SOLUTION;
} else if (hasOneSolution()) {
result = ONE_SOLUTION;
} else if (hasTwoSolutions()) {
result = TWO_SOLUTIONS;
}
return result;
}
void QuadraticCalculator::printSolutions() {
double x1;
double x2;
if (hasNoSolution() || hasInfinitySolutions() || hasNoRealSolution()) {
cout << endl;
} else {
if (hasTwoSolutions()) {
x1 = (-b + sqrt(discriminant())) / 2*a;
x2 = (-b - sqrt(discriminant())) / 2*a;
cout << " x1=" << x1 << " and " << "x2=" << x2 << endl;
} else if (hasOneSolution()) {
x1 = -b / 2*a;
cout << " x=" << x1 << endl;
}
}
}
int main() {
double a;
double b;
double c;
cout << "Please enter value of a: ";
cin >> a;
cout << "Please enter value of b: ";
cin >> b;
cout << "Please enter value of c: ";
cin >> c;
QuadraticCalculator calc(a, b, c);
cout << "The equation has " << calc.numberOfSolutions();
calc.printSolutions();
return 0;
}
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