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# Giải Phương Trình Bậc II

anhkiet2507 Sep 7th, 2018 12,068 Never
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1. #include <iostream>
2. #include <string>
3. using namespace std;
4. // Khai bao cac bien, ham can su dung
5. double a{ 0 };
6. double b{ 0 };
7. double c{ 0 };
8. double delta{ 0 };
9. void loop();
10. int main();
15. // Ham tinh nghiem
16. int nghiem()
17. {
18.     double d{ 0 };
19.     double nghiem1{ 0 };
20.     double nghiem2{ 0 };
21.     d = sqrt(delta);
22.     nghiem1 = ((-b + d) / (2 * a));
23.     nghiem2 = ((-b - d) / (2 * a));
24.     if (nghiem1 == nghiem2)
25.     {
26.         cout << "Nghiem kep la:" << nghiem2 << endl;
27.         loop();
28.     }
29.     else
30.     {
31.         cout << "Nghiem 1 la:" << nghiem1 << endl;
32.         cout << "Nghiem 2 la:" << nghiem2 << endl;
33.         loop();
34.     }
35.     return 0;
36. }
37. // Ham tiep tuc hoac dung chuong trinh
38. void loop()
39. {
40.     int check{ 0 };
41.     cout << "Tiep tuc nhap 1. Thoat chuong trinh nhap 0: ";
42.     cin >> check;
43.     switch (check)
44.     {
45.     case 1:
46.         main();
47.         break;
48.     case 0:
49.         cout << "Dang Thoat \n";
50.         exit(0);
51.         break;
52.     default:
53.         cout << "Nhap sai \n";
54.         loop();
55.         break;
56.
57.     /* int check{ 0 };
58.     cout << "Tiep tuc nhap 1. Thoat chuong trinh nhap 0: ";
59.     cin >> check;
60.     if (check == 1)
61.     {
62.         main();
63.     }
64.     else if (check == 0)
65.     {
66.         cout << "Dang Thoat \n";
67.         exit(0);
68.     }
69.     else
70.     {
71.         cout << "Nhap Sai \n";
72.         loop(); */
73.     }
74. }
77. {
78. /* do
79. {
80. system("cls");
81.
82. cout << "Nhap Username: ";
84.
85. cout << "Nhap Password: ";
88. } */
89.     return 0;
90. }
91. // Chuong trinh chinh
92. int main()
93. {
95.
96.     // Intro
97.     cout << "Chuong trinh giai phuong trinh bac hai" << endl;
98.     cout << "Phuong trinh bac 2 co dang ax^2+bx+c" << endl;
99.     // Nhap he so
100.     cout << "Nhap a:";
101.     cin >> a;
102.     cout << "Nhap b:";
103.     cin >> b;
104.     cout << "Nhap c:";
105.     cin >> c;
106.     cout << "Bo so a b c cua ban la " << "a=" << a << ";" << "b=" << b << ";" << "c=" << c << endl;
107.     // Tinh Delta
108.     delta = (b * b) - (4 * a * c);
109.     cout << "Delta tinh duoc la " << delta << endl;
110.     if (delta >= 0)
111.     {
112.         cout << "Phuong trinh co nghiem\n";
113.         nghiem();
114.     }
115.     else
116.         cout << "Phuong trinh vo nghiem\n";
117.     loop();
118.     system("pause");
119. }
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