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Link: http://codepad.org/18ocSsBW    [ raw code | output | fork ]

C, pasted on Aug 23:
#include<iostream>
#include<cmath>
using namespace std;

const int NoSolution = 0, Undetermined = -1;
int EqualDeg1(double a, double b, double &x)                            // Phương trình bậc 1
{
	int nSolution1;                                                     // Số nghiệm
	if(a != 0) 
	{
		x = -b / a;
		nSolution1 = 1;
	}
	else                                                               // a = 0
	{
		x = 0;
		if(b == 0)
			nSolution1 = Undetermined;                                  // Phương trình vô định ( có vô số nghiệm)
		else
			nSolution1 = NoSolution;                                    // Phương trình vô nghiệm
	}
	return nSolution1;
}
int EqualDeg2(double a, double b, double c, double &x1, double &x2)    // Phương trình bậc 2
{
	int nSolution2; x1 = x1 = 0;                                      // Mặc định
	if(a == 0)                                                           
		nSolution2 = EqualDeg1(b,c, x1);
	else
	{
		double Delta = b * b - 4 * a * c; double two_a = 2 * a;
		if(Delta < 0)
			nSolution2 = NoSolution;                                  // Phương trình vô nghiệm
		else if(Delta == 0)
		{
			x1 = x2 = -b / two_a;
			nSolution2 = 1;                                           // Phương trình có 1 nghiệm kép
		}
		else
		{
			double sqrtDelta = sqrt(Delta);
			x1 = (-b - sqrtDelta) / two_a;
			x2 = (-b + sqrtDelta) / two_a;
			nSolution2 = 2;                                           // Phương trình có 2 nghiệm phân biệt
		}
	}
	return nSolution2;
}
int EqualQuartic(double a, double b, double c, 
				 double &x1, double &x2, double &x3, double &x4)       // Phương trình trùng phương
{
	int nSolution, nSolution1, nSolution2;
	double y1, y2;
	x1 = x2 = 0 ; x3 = x4 = 0;                                            //  Mặc định
	nSolution1 = EqualDeg2(a, b, c, y1, y2);
	switch(nSolution1)
	{
	case NoSolution: case Undetermined:
		nSolution = nSolution1; break;
	case 1:
		nSolution = EqualDeg2(1, 0, -y1, x1, x2); break;
	case 2:
		nSolution2 = EqualDeg2(1, 0, -y1, x1, x2);
		switch(nSolution2)
		{
		case NoSolution:
			nSolution = EqualDeg2(1, 0, -y2, x1, x2); break;
		case 1:
			nSolution = 1 + EqualDeg2(1, 0, -y2, x2, x3); break;
		case 2:
			nSolution = 2 + EqualDeg2(1, 0, -y2, x3, x4); break;
		}
	}
	return nSolution;
}
int main()
{
	/*double a, b, x;
	cout << "Input a = " ;
	cin >> a;
	cout << "Input b = " ;
	cin >> b;
	
	int nSolution = EqualDeg1(a, b, x);
	cout << "So nghiem cua phuong trinh la: " << nSolution << endl;
	if(a != 0)
	cout << "Nghiem cua phuong trinh " << a << "x + " << b << " = 0 "    "la: " << x << endl;
	else
		if(b == 0)
		cout << "Nghiem cua phuong trinh " << a << "x + " << b << " = 0 "    "la: vo so nghiem "  << endl;
		else
		cout << "Nghiem cua phuong trinh " << a << "x + " << b << " = 0 "    "la: vo nghiem "  << endl;*/

	double a, b, c, x1, x2;
	
	cout << "Input a = " ;
	cin >> a;
	cout << "Input b = " ;
	cin >> b;
	cout << "Input c = " ;
	cin >> c;
	double Delta = b * b - 4 * a * c; double two_a = 2 * a;
	int numSolution = EqualDeg2(a, b, c, x1, x2);
	cout << "So nghiem cua phuong trinh la: " << numSolution << endl;
	if(a == 0)
	{
		if(b != 0)
		cout << "Nghiem cua phuong trinh " << b << "x + " << c << " = 0 "   "la: " << x1 << endl;
	    else
		   if(c == 0)
		   cout << "Nghiem cua phuong trinh " << b << "x + " << c << " = 0 "    "la: vo so nghiem "  << endl;
		   else
		   cout << "Nghiem cua phuong trinh " << b << "x + " << c << " = 0 "    "la: vo nghiem "  << endl;
	}
	else
	{
		if(Delta < 0)
			cout << "Phuong trinh " << a << "x^2 + " << b << "x + " << c << " = 0 "    "la: vo nghiem " << endl;
		else if(Delta == 0)
			cout << "Phuong trinh " << a << "x^2 + " << b << "x + " << c << " = 0 "    "co 1 nghiem kep la: x1 = x2 = " << x1 << endl;
		else
			cout << "Phuong trinh " << a << "x^2 + " << b << "x + " << c << " = 0 "    "co 2 nghiem phan biet: " << x1 << " va " << x2 << endl;
	}
	system("pause");
	return 0;
}


Output:
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Line 18: error: iostream: No such file or directory
Line 15: error: cmath: No such file or directory
Line 3: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'namespace'
Line 6: error: expected ';', ',' or ')' before '&' token
Line 24: error: expected ';', ',' or ')' before '&' token
Line 50: error: expected ';', ',' or ')' before '&' token
In function 'main':
Line 96: error: 'cout' undeclared (first use in this function)
Line 96: error: (Each undeclared identifier is reported only once
Line 96: error: for each function it appears in.)
Line 97: error: 'cin' undeclared (first use in this function)
Line 104: error: 'endl' undeclared (first use in this function)


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