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Предоплата всего
Подписываем
№1
package complexNumber;
public class ComplexNumber {
float real, img; // опис змінних комплексного числа
public ComplexNumber(){ // конструктор за замовчуванням
this.img = 0;
this.real = 0;
}
public ComplexNumber(float real, float img){ // конструктор з 2 параметрами
this.real = real;
this.img = img;
}
public String toString (){// метод для виведення комплексного числа
return new String(this.real+" + "+this.img+"i");
}
public float abs (ComplexNumber a){ //модуль комплексного числа
return (float) Math.sqrt( a.real*a.real + a.img*a.img );
}
public ComplexNumber add(ComplexNumber a, ComplexNumber b){ // сума
return new ComplexNumber(a.real+b.real,a.img+b.img);
}
public ComplexNumber sub(ComplexNumber a, ComplexNumber b){ // різниця
return new ComplexNumber(a.real-b.real,a.img-b.img);
}
public ComplexNumber multipication(ComplexNumber a, ComplexNumber b){ // множення
ComplexNumber c = new ComplexNumber();
c.real = a.real*b.real - a.img*b.img ;
c.img = b.real*a.img + a.real*b.img;
return c;
}
public static void main(String args[]){
}
}
№2
package Vector;
public class Vector3D {
float x,y,z;
public Vector3D() {
this.x = 0;
this.y = 0;
this.z = 0;
}
public Vector3D(float x, float y, float z){
this.x = x;
this.y = y;
this.z = z;
}
public String toString (){
return new String("x = "+this.x+" y = "+this.y+" z = "+this.z );
}
public static Vector3D multK (Vector3D v , int k){
return new Vector3D(v.x*k, v.y*k, v.z*k);
}
public static Vector3D add (Vector3D a, Vector3D b){
return new Vector3D( a.x+b.x, a.y+b.y, a.z+b.z);
}
public static float sklMult(Vector3D a, Vector3D b){
return (float) (a.x*b.x+a.y*b.y+a.z*b.z);
}
public static Vector3D vecMult (Vector3D a, Vector3D b){
//v/a × b = {y1 z2 - z1 y2; z1 x2 - x1 z2; x1 y2 - y1 x2}
float x = a.y*b.z - a.z*b.y;
float y = a.z*b.x - a.x*b.z;
float z = a.x*b.y - a.y*b.x;
return new Vector3D(x,y,z);
}
public static float abs(Vector3D a){
return (float) Math.sqrt(a.x*a.x+a.y*a.y+a.z*a.z);
}
public static void main (String args[]){
}
}
№3
public class Matrix {
int matrinx[][] = new int [2][2];
public Matrix(){
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
matrinx[i][j] = 0;
}
}
public Matrix (int matr[][]) {
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
matrinx[i][j] = matr[i][j];
}
}
public static Matrix add(Matrix a, Matrix b){
Matrix c = new Matrix();
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
c.matrinx[i][j] = a.matrinx[i][j]+b.matrinx[i][j];
}
return c;
}
public static Matrix multK (Matrix a, int k){
Matrix c = new Matrix();
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
c.matrinx[i][j] = a.matrinx[i][j]*k;
}
return c;
}
public static Matrix mult (Matrix a, Matrix b){
Matrix c = new Matrix();
for (int i = 0; i < 2 ; i++)
for (int j = 0; j < 2 ; j++)
for (int k = 0; k < 2 ; k++)
c.matrinx[i][j] += a.matrinx[i][k] * b.matrinx[k][j];
return c;
}
public static float determinant (Matrix a){
return (a.matrinx[0][0]*a.matrinx[1][1]-a.matrinx[0][1]*a.matrinx[1][0]);
}
public static void main (String args[]){
}
}
№4
package triangle_4;
public class Triangle {
float a,b,c;
public Triangle(float a,float b, float c){
if ((a > 0) && (b>0) && (c>0)){
this.a = a;
this.b = b;
this.c = c;
} else System.out.println("error create triangle !");
}
public static float perimetr(Triangle t){
return (t.a+t.b+t.c);
}
public static float pl (Triangle t){
return (float) Math.sqrt(perimetr(t)*(perimetr(t)-t.a)*(perimetr(t)-t.b)*(perimetr(t)-t.c));
}
public static void main (String args []){
}
}
№5
package square__5;
public class Square {
float a;
public Square(){
}
public Square(float a){
if (a>0) this.a = a;
else System.out.println("error create square");
}
public static float perymetr(Square t){
return t.a*4;
}
public static float square (Square t){
return t.a*t.a;
}
public static float diag (Square t){
return (float) (Math.sqrt(2)*t.a);
}
public static void main (String args[]){
}
}
№6
public class Circle {
float x,y,r;
public Circle(){
x = 0;
y = 0;
r = 0;
}
public Circle(float x, float y, float r){
this.x = x;
this.y = y;
this.r = r;
}
public static float legthCircle(Circle c){
return (float) (2*Math.PI*c.r);
}
public static float square (Circle c){
return (float) (Math.PI*(c.r*c.r));
}
public static boolean inCircle (Circle c, float x,float y){
if ( ((x-c.x)*(x-c.x)+(y-c.y)*(y-c.y)<=c.r*c.r)) return true;
else return false;
}
public static void main(String[] args) {
}
}
№7
public class Cube {
float a;
public Cube() {
a = 0;
}
public Cube(float a) {
this.a = a;
}
public static float square (Cube c){
return c.a*c.a*6;
}
public static float objem (Cube c){
return c.a*c.a*c.a;
}
public static float diag (Cube c){
return (float) Math.sqrt(3*(c.a*c.a));
}
public static void main(String[] args) {
} }
№8
public class Pryzma {
float a, h;
public Pryzma (){
a = 0;
h = 0;
}
public Pryzma (float a, float h){
this.a = a;
this.h = h;
}
public static float pl(Pryzma p){
return (float) ((Math.sqrt(3)/4)*(p.a*p.a))*2 * (1/2*(3*p.a)*p.h);
}
public static float objem(Pryzma p){
return (float)((Math.sqrt(3)/4)*(p.a*p.a)*p.h);
}
public static void main (String args[]){
}
}
№10
import java.io.*;
import java.util.Scanner;
public class FileIO {
private static Scanner scanner;
public static int countWordsStr (String str){
int counter = 0;
int i=0;
for (int j = 0; j < str.length(); j++) {
if ((str.charAt(j) == ' ') ) {
if (j > i) {
counter++;
}
i = j + 1;} }
if (i < str.length()) {
counter++;}
return counter;}
public static int countWordsInFile(String fileName) throws IOException{
File file = new File(fileName);
System.out.println("File name : "+file.getName());
BufferedReader br = new BufferedReader (new InputStreamReader(new FileInputStream(fileName), "UTF-8"));
String line = null;
int countWords=0;
while ((line = br.readLine()) != null) {
countWords+= countWordsStr(line);
}
br.close();
return countWords;
}
public static String getFileName() {
boolean fOpen = false;
String fileName = null;
while (!fOpen){
System.out.print("Write path to file : ");
scanner = new Scanner(System.in);
fileName = new String(scanner.next());
fOpen = new File(fileName).exists();
if (!fOpen) {
System.out.println("Error path to file"); } }
return fileName; }
public static void main(String[] args) throws IOException, FileNotFoundException {
String fileName = getFileName();
System.out.println("In file : "+new File(fileName).getName()+" "+countWordsInFile(fileName)+" words"); } }
№11
import java.io.*;
import java.util.Scanner;
public class Lab6 {
public static void main(String[] args) {
String fname = null;
try {
Scanner in = new Scanner(System.in);
System.out.println("задайте файл введення ");
fname = in.nextLine();
FileInputStream fin = new FileInputStream(fname);
//FileInputStream fin = new FileInputStream("D:/in.txt");
BufferedReader myInput = new BufferedReader
(new InputStreamReader(fin));
System.out.println("задайте файл виведення ");
fname = in.nextLine();
DataOutputStream fout = new DataOutputStream( new BufferedOutputStream( new FileOutputStream(fname)));
String c;
while ((c = myInput.readLine()) != null) {
if (c==null)
continue;
while (c.charAt(0) == ' '){
c = c.substring(1);
}
while (c.charAt(c.length()-1) == ' '){
c = c.substring(0,c.length()-1);
}
boolean next = true;
while (next){
next = false;
for (int i=0;i<c.length()-1;i++)
if (c.charAt(i)==' ' && c.charAt(i+1)==' '){
c = c.substring(0, i)+c.substring(i+1);
next = true;
break; } }
fout.writeBytes(c);
String newLine = System.getProperty("line.separator");
fout.writeBytes(newLine);
System.out.println(c); }
fin.close();
fout.close();
} catch (FileNotFoundException ex) {
System.out.println("Файл "+fname+" не знайдено");
} catch (Exception ex) { }
}
}
№12
import java.util.Scanner;
import java.util.Stack;
public class MyStack {
public static Scanner in;
public static void main(String[] args) {
in = new Scanner(System.in);
int n = in.nextInt();
String str = String.valueOf(n);
Stack<Object> stck = new Stack<>();
for (int i=0; i<str.length();i++){
stck.push(str.charAt(i));
}
String str1 = new String();
while (!stck.empty()){
str1+=stck.pop();
}
try{
n = Integer.parseInt(str1);
System.out.println(n);
}
catch (NumberFormatException e){
e.printStackTrace();
}
}
}
№14
import java.util.Stack;
public class BracketsValidator {
private Stack<Character> stack = new Stack<Character>();
private boolean isOpeningBracket(char bracket) {
return "({[".indexOf(bracket) != -1;
}
private boolean isClosingBracket(char bracket) {
return ")}]".indexOf(bracket) != -1;
}
private boolean isPair(char opening, char closing) {
return opening == '(' && closing == ')' || opening == '['
&& closing == ']' || opening == '{' && closing == '}';
}
public boolean validate(String input) {
for (char c : input.toCharArray()) {
if (isClosingBracket(c) && stack.isEmpty()) {
return false;
}
if (isOpeningBracket(c)) {
stack.push(c);
}
if (isClosingBracket(c)) {
if (isPair(stack.peek(), c)) {
stack.pop();
} else {
return false;
}
}
}
return stack.isEmpty();
}
public static void main(String[] args) {
String test = "a + (42 - b) * [wtf(){{}}] / {(2 + 2)}";
//String test = "a + (42 - b) * [wtf({'}')] / {(2 + 2)}";
BracketsValidator validator = new BracketsValidator();
boolean correct = validator.validate(test);
System.out.println( "скобки розставлено " + (correct ? "" : "не ") + "правильно");
}
}
№15
public class Main_7 {
static Scanner scan = new Scanner(System.in);
public static void main(String[] args) {
LinkedList<Float> Polynom1 = new LinkedList<Float>();
LinkedList<Float> Polynom2 = new LinkedList<Float>();
LinkedList<Float> Result = new LinkedList<Float>();
int step=scan.nextInt();
for (int i = 0; i <= step; i++) {
float rand1 = (float)(1 + Math.random() * 50);
float rand2 = (float)(1 + Math.random() * 50);
Polynom1.add(rand1);
Polynom2.add(rand2);
}
System.out.print("Pol1=");
for(int i=0;i<step;i++)
System.out.print(Polynom1.get(i)+"x^"+(step-i)+"+");
System.out.print(Polynom1.get(step)+"\n");
System.out.print("Pol2=");
for(int i=0;i<step;i++)
System.out.print(Polynom2.get(i)+"x^"+(step-i)+"+");
System.out.print(Polynom2.get(step)+"\n");
for(int i=0;i<=step;i++)
for(int j=0;j<=step;j++)
Result.add(Polynom1.get(i)*Polynom2.get(j));
System.out.print("Result=");
for(int i=0;i<=step;i++)
System.out.print(Result.get(i)+"x^"+(2*step-i)+"+");
//System.out.print(Result.get(step)+"x^"+"+");
for(int i=step+1;i<2*(step+1);i++)
System.out.print(Result.get(i)+"x^"+(2*(step+1)-i)+"+");
//System.out.print(Result.get(2*step)+"\n");
}
}