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Laba3_1 - Pastebin.com
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- #include <iostream>
- #include <cmath>
- using namespace std;
- const double EPS = 1E-6;
- int main() {
- setlocale(LC_ALL, "Russian");
- double a, b, x, fa, fb, fx;
- bool isCorrect;
- cout << "Программа уточняет корень уравнения методом половинного деления" << endl;
- do {
- isCorrect = false;
- cout << "Введите значение a : ";
- cin >> a;
- if (cin.fail() or (a < 0)) {
- isCorrect = true;
- cout << "Ошибка" << endl;
- cin.clear();
- while (cin.get() != '\n');
- }
- } while (isCorrect);
- do {
- isCorrect = false;
- cout << "Введите значение b : ";
- cin >> b;
- if (cin.fail() or (b < a)) {
- isCorrect = true;
- cout << "Ошибка" << endl;
- cin.clear();
- while (cin.get() != '\n');
- }
- } while (isCorrect);
- fa = exp(a) - 10 * a;
- fb = exp(b) - 10 * b;
- if (fa * fb > 0) {
- cout << "На отрезке [A, B] нет корня или их четное количество." << endl;
- return 1;
- }
- do {
- x = (a + b) / 2;
- fx = exp(x) - 10 * x;
- if (fa * fx < 0) {
- b = x;
- fb = fx;
- }
- else {
- a = x;
- fa = fx;
- }
- } while (fabs(b - a) > EPS && fabs(fx) > EPS);
- cout << "Корень уравнения: " << x << endl;
- return 0;
- }
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