Viết Chương Trình Giải Phương Trình Bậc 2: Ax^2 + Bx +c =0 · GitHub

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TheHeroTheWorldNeeds/assignment5.cpp Last active November 13, 2018 17:23 Show Gist options

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#include <iostream>

using namespace std;

#include <math.h>

int main()

{

float a, b, c;

cout << "\t\t------- PHUONG TRINH BAC II: ax^2 + bx + c = 0 -------";

cout << "\nEnter a: ";

cin >> a;

cout << "\nEnter b: ";

cin >> b;

cout << "\nEnter c: ";

cin >> c;

cout << "\nGiai phuong trinh bac II : " << a << "x^2 + " << b << "x + " << c << " = 0" << endl;

if (a == 0)

{

if (b == 0)

{

if (c == 0)

{

cout << "Phuong trinh vo so nghiem";

}

else

{

cout << "Phuong trinh vo nghiem";

}

}

else

{

cout << "Tro ve giai phuong trinh bac I: " << b << "x + " << c << " = 0";

cout << "\n\tNghiem cua pt x = " << (float)-c/b << endl;

}

}

else

{

float x1, x2;

float Delta = (b * b) - (4 * a * c);

if (Delta < 0)

{

cout << "Phuong trinh vo nghiem";

}

else if (Delta == 0)

{

cout << "Phuong trinh co no kep x = " << (float)-b / (2 * a);

}

else

{

cout << "Phuong trinh co 2 nghiem phan biet: ";

x1 = (-b + sqrt(Delta)) / (2 * a);

x2 = (-b - sqrt(Delta)) / (2 * a);

cout << "\n\t\tx1 = " << x1;

cout << "\n\t\tx2 = " << x2;

}

}

cout << endl;

system("pause");

return 0;

}

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