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C++ - Giải phương trình bậc một ax + b = 0
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C++ - Giải phương trình bậc một ax + b = 0
Viết chương trình giải phương trình bậc một ax + b = 0 (với a, b là 2 số nguyên nhập từ bàn phím).
Bài giải
-------------------- ######## --------------------
Phương trình tuyến tính (hay còn gọi là phương trình bậc một hay phương trình bậc nhất) là một phương trình đại số có dạng: f(x) = ax + b = 0. Trong đó:
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
b là một hằng số (hay hệ số bậc 0).
a là hệ số bậc một.
Tìm nghiệm của phương trình bậc một như sau:
x = -b/a (Nếu a khác 0)
Vô số nghiệm nếu a = 0 và b = 0
Vô nghiệm nếu a = 0 và b khác 0.
Giải phương trình bậc một bằng cách sử dụng cấu trúc điều khiển if else
trong C++ như sau:
#include <iostream>
using namespace std;
int main()
{
int a;
int b;
double nghiem;
cout << "Nhap a = ";
cin >> a;
cout << "Nhap b = ";
cin >> b;
if(a == 0) {
if (b == 0) {
cout << "Phuong trinh vo so nghiem" << endl;
} else {
cout << "Phuong trinh vo nghiem" << endl;
}
} else {
nghiem = (double)-b/a;
cout << "Phuong trinh co nghiem la: " << nghiem << endl;
}
return 0;
}
Kết quả sau khi thực thi chương trình trên:
Bài viết này được đăng tại [free tuts .net]
Khi nhập vào a = 2 và b = 3 :
Khi nhập vào a = 0 và b = 0:
Khi nhập vào a = 0 và b = 4:
8. Bài tập if else C++
Cùng chuyên mục: