Практикум по программированию. Основы. Ветвление. Корни уравнения
From AsIsWiki
(Difference between revisions)
| Line 136: | Line 136: | ||
var d = b * b - 4 * a * c; | var d = b * b - 4 * a * c; | ||
var x1, x2; | var x1, x2; | ||
| − | var | + | var result = ""; |
if (d > 0) { | if (d > 0) { | ||
| Line 143: | Line 143: | ||
x2 = (-b - Math.sqrt(d)) / (2 * a); | x2 = (-b - Math.sqrt(d)) / (2 * a); | ||
| − | + | result = "X1 = " + x1.toFixed(3) + "<br>" + | |
| − | + | "X2 = " + x2.toFixed(3); | |
} else if (d == 0) { | } else if (d == 0) { | ||
| Line 150: | Line 150: | ||
x1 = -b / (2 * a); | x1 = -b / (2 * a); | ||
| − | + | result = "X = " + x1.toFixed(3); | |
| − | + | ||
} else { | } else { | ||
| − | + | result = "Уравнение корней не имеет"; | |
| − | + | ||
} | } | ||
| − | document.getElementById(" | + | document.getElementById("resultId").innerHTML = result; |
| − | + | ||
} | } | ||
</script> | </script> | ||
| Line 172: | Line 169: | ||
<p>Введите C: <input id="cId" size="5"></p> | <p>Введите C: <input id="cId" size="5"></p> | ||
<hr> | <hr> | ||
| − | <p id=" | + | <p id="resultId"></p> |
| − | + | ||
<button onclick="calc()">Рассчитать</button> | <button onclick="calc()">Рассчитать</button> | ||
Revision as of 09:22, 18 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;
var result = "";
if (d > 0) {
x1 = (-b + Math.sqrt(d)) / (2 * a);
x2 = (-b - Math.sqrt(d)) / (2 * a);
result = "X1 = " + x1.toFixed(3) + "<br>" +
"X2 = " + x2.toFixed(3);
} else if (d == 0) {
x1 = -b / (2 * a);
result = "X = " + x1.toFixed(3);
} else {
result = "Уравнение корней не имеет";
}
document.getElementById("resultId").innerHTML = result;
}
</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="resultId"></p>
<button onclick="calc()">Рассчитать</button>
</body>
</html>