Практикум по программированию. Основы. Ветвление. Корни уравнения
From AsIsWiki
(Difference between revisions)
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==Java== | ==Java== | ||
| − | < | + | <source lang="java"> |
import java.util.Scanner; | import java.util.Scanner; | ||
import java.lang.Math; | import java.lang.Math; | ||
| Line 14: | Line 14: | ||
public static void main(String[] args) { | public static void main(String[] args) { | ||
| − | + | ||
Scanner in = new Scanner(System.in); | 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(" Поиск корней уравнения A * X^2 + B * X + C = 0"); |
System.out.println("------------------------------------------------"); | System.out.println("------------------------------------------------"); | ||
| − | System.out.print(" Введите A: "); | + | System.out.print(" Введите A: "); |
| − | + | double a = in.nextDouble(); | |
| − | System.out.print(" Введите B: "); | + | System.out.print(" Введите B: "); |
| − | + | double b = in.nextDouble(); | |
| − | System.out.print(" Введите C: "); | + | System.out.print(" Введите C: "); |
| − | + | double c = in.nextDouble(); | |
System.out.println("------------------------------------------------"); | 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"); | |
| − | + | ||
| + | } | ||
} | } | ||
} | } | ||
| − | </ | + | </source> |
==C++== | ==C++== | ||
| − | < | + | <source lang="cpp"> |
| − | </ | + | // 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; | ||
| + | } | ||
| + | </source> | ||
| + | |||
| + | |||
| + | ==Python== | ||
| + | |||
| + | <source lang="cpp"> | ||
| + | # Python 3 | ||
| + | |||
| + | import math | ||
| + | |||
| + | print('\n Поиск корней уравнения A * X^2 + B * X + C = 0') | ||
| + | print('------------------------------------------------') | ||
| + | |||
| + | a = float(input(' Введите A: ')) | ||
| + | b = float(input(' Введите B: ')) | ||
| + | c = float(input(' Введите C: ')) | ||
| + | |||
| + | print('------------------------------------------------') | ||
| + | |||
| + | d = b * b - 4 * a * c | ||
| + | |||
| + | if d > 0: | ||
| + | |||
| + | x1 = (-b + math.sqrt(d)) / (2 * a) | ||
| + | x2 = (-b - math.sqrt(d)) / (2 * a) | ||
| + | |||
| + | print(' X1 = %.3f' % x1) | ||
| + | print(' X2 = %.3f' % x2) | ||
| + | |||
| + | elif d == 0: | ||
| + | |||
| + | x1 = -b / (2 * a) | ||
| + | |||
| + | print(' X = %.3f' % x1) | ||
| + | |||
| + | else: | ||
| + | |||
| + | print(' Уравнение корней не имеет') | ||
| + | </source> | ||
==Pascal== | ==Pascal== | ||
| − | < | + | <source lang="delphi"> |
| − | </ | + | </source> |
| + | |||
| + | |||
| + | ==JavaScript== | ||
| + | |||
| + | <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; | ||
| + | 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> | ||
| + | </source> | ||
Latest revision as of 20:09, 19 November 2017
Contents |
[edit] 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");
}
}
}
[edit] 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;
}
[edit] Python
# Python 3
import math
print('\n Поиск корней уравнения A * X^2 + B * X + C = 0')
print('------------------------------------------------')
a = float(input(' Введите A: '))
b = float(input(' Введите B: '))
c = float(input(' Введите C: '))
print('------------------------------------------------')
d = b * b - 4 * a * c
if d > 0:
x1 = (-b + math.sqrt(d)) / (2 * a)
x2 = (-b - math.sqrt(d)) / (2 * a)
print(' X1 = %.3f' % x1)
print(' X2 = %.3f' % x2)
elif d == 0:
x1 = -b / (2 * a)
print(' X = %.3f' % x1)
else:
print(' Уравнение корней не имеет')
[edit] Pascal
[edit] 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>