Практикум по программированию. Основы. Ветвление. Корни уравнения
From AsIsWiki
(Difference between revisions)
Line 125: | Line 125: | ||
<source lang="js"> | <source lang="js"> | ||
+ | <html lang="ru"> | ||
+ | <head> | ||
+ | <meta charset="UTF-8"> | ||
+ | <script> | ||
+ | function calc() { | ||
+ | var a = document.getElementById("aId").value; | ||
+ | var b = document.getElementById("bId").value; | ||
+ | var c = document.getElementById("cId").value; | ||
+ | |||
+ | var d = b * b - 4 * a * c; | ||
+ | var x1, x2; | ||
+ | |||
+ | if (d > 0) { | ||
+ | |||
+ | x1 = (-b + Math.sqrt(d)) / (2 * a); | ||
+ | x2 = (-b - Math.sqrt(d)) / (2 * a); | ||
+ | |||
+ | document.getElementById("result1Id").innerHTML = | ||
+ | "X1 = " + x1.toFixed(3); | ||
+ | document.getElementById("result2Id").innerHTML = | ||
+ | "X2 = " + x2.toFixed(3); | ||
+ | |||
+ | } else if (d == 0) { | ||
+ | |||
+ | x1 = -b / (2 * a); | ||
+ | |||
+ | document.getElementById("result1Id").innerHTML = | ||
+ | "X = " + x1.toFixed(3); | ||
+ | } else { | ||
+ | |||
+ | document.getElementById("result1Id").innerHTML = | ||
+ | "Уравнение корней не имеет"; | ||
+ | } | ||
+ | } | ||
+ | </script> | ||
+ | </head> | ||
+ | <body> | ||
+ | |||
+ | <p>Поиск корней уравнения A * X^2 + B * X + C = 0</p> | ||
+ | <hr> | ||
+ | <p>Введите A: <input id="aId" size="5"></p> | ||
+ | <p>Введите B: <input id="bId" size="5"></p> | ||
+ | <p>Введите C: <input id="cId" size="5"></p> | ||
+ | <hr> | ||
+ | <p id="result1Id"></p> | ||
+ | <p id="result2Id"></p> | ||
+ | |||
+ | <button onclick="calc()">Рассчитать</button> | ||
+ | |||
+ | </body> | ||
+ | </html> | ||
</source> | </source> | ||
Revision as of 08:11, 16 March 2016
Contents |
Java
import java.util.Scanner; import java.lang.Math; public class Task01 { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println(); System.out.println(" Поиск корней уравнения A * X^2 + B * X + C = 0"); System.out.println("------------------------------------------------"); System.out.print(" Введите A: "); double a = in.nextDouble(); System.out.print(" Введите B: "); double b = in.nextDouble(); System.out.print(" Введите C: "); double c = in.nextDouble(); System.out.println("------------------------------------------------"); double d = b * b - 4 * a * c; double x1, x2; if (d > 0) { x1 = (-b + Math.sqrt(d)) / (2 * a); x2 = (-b - Math.sqrt(d)) / (2 * a); System.out.printf(" X1 = %.3f\n", x1); System.out.printf(" X2 = %.3f\n", x2); } else if (d == 0) { x1 = -b / (2 * a); System.out.printf(" X = %.3f\n", x1); } else { System.out.println(" Уравнение корней не имеет"); } } }
C++
// g++ 4.2 #include <iostream> #include <math.h> using namespace std; int main() { double a, b, c; cout << "\n Поиск корней уравнения A * X^2 + B * X + C = 0\n"; cout << "------------------------------------------------\n"; cout << " Введите A: "; cin >> a; cout << " Введите B: "; cin >> b; cout << " Введите C: "; cin >> c; cout << "------------------------------------------------\n"; double d = b * b - 4 * a * c; double x1, x2; if (d > 0) { x1 = (-b + sqrt(d)) / (2 * a); x2 = (-b - sqrt(d)) / (2 * a); printf(" X1 = %.3f\n", x1); printf(" X2 = %.3f\n", x2); } else if (d == 0) { x1 = -b / (2 * a); printf(" X = %.3f\n", x1); } else { cout << " Уравнение корней не имеет\n"; } cout << "\n"; return 0; }
Pascal
JavaScript
<html lang="ru"> <head> <meta charset="UTF-8"> <script> function calc() { var a = document.getElementById("aId").value; var b = document.getElementById("bId").value; var c = document.getElementById("cId").value; var d = b * b - 4 * a * c; var x1, x2; if (d > 0) { x1 = (-b + Math.sqrt(d)) / (2 * a); x2 = (-b - Math.sqrt(d)) / (2 * a); document.getElementById("result1Id").innerHTML = "X1 = " + x1.toFixed(3); document.getElementById("result2Id").innerHTML = "X2 = " + x2.toFixed(3); } else if (d == 0) { x1 = -b / (2 * a); document.getElementById("result1Id").innerHTML = "X = " + x1.toFixed(3); } else { document.getElementById("result1Id").innerHTML = "Уравнение корней не имеет"; } } </script> </head> <body> <p>Поиск корней уравнения A * X^2 + B * X + C = 0</p> <hr> <p>Введите A: <input id="aId" size="5"></p> <p>Введите B: <input id="bId" size="5"></p> <p>Введите C: <input id="cId" size="5"></p> <hr> <p id="result1Id"></p> <p id="result2Id"></p> <button onclick="calc()">Рассчитать</button> </body> </html>