C,
pasted
on Aug 23:
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#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;
}
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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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