tasks 1-5, solution proposals

intro/src/main/java/com/epam/courses/java/fundamentals/intro/practice/task2/MinFinder.java

@@ -33,7 +33,11 @@ private boolean filter(double a) {
   }
 
   private int findMin() {
-    //todo реализовать
-    return 0;
+    for (int i = 1; ; i++){
+        double a = getA(i);
+        if (filter(a)){
+          return i;}
+        out.println(a);
+    }
   }
 }

intro/src/main/java/com/epam/courses/java/fundamentals/intro/practice/task3/Table.java

@@ -11,7 +11,7 @@ public class Table {
   public Table(double start, double end, double step) {
 
     if (end <= start)
-      throw new RuntimeException("End value shoult be bigger then start, but it's not.");
+      throw new RuntimeException("End value should be bigger than start, but it's not.");
 
     this.start = start;
     this.end = end;
@@ -22,13 +22,23 @@ static double[] getDataAndResultPair(double x) {
     return new double[]{x, function(x)};
   }
 
+
   static double function(double x) {
     return tan(2 * x) - 3;
   }
 
   public double[][] getTable() {
+    int rows = (int) ((end-start)/step) + 1;
+    int columns = 2;
+    double[][] table = new double[rows][columns];
+    for (int row = 0; row<rows; row++){
+      double x = start + row*step;
+      table[row][0] = x;
+      table [row][1] = function(x);
+    }
+
 
     //todo реализовать
-    return new double[0][0];
+    return table;
   }
 }

intro/src/main/java/com/epam/courses/java/fundamentals/intro/practice/task3/TablePrinter.java

@@ -1,9 +1,9 @@
 package com.epam.courses.java.fundamentals.intro.practice.task3;
 
-import static java.lang.System.out;
-
 import java.io.PrintStream;
 
+import static java.lang.System.out;
+
 public class TablePrinter {
 
   private final Table table;
@@ -27,12 +27,22 @@ private void printTable(int quantity, PrintStream out) {
   }
 
   private void printBottom(int quantity, PrintStream out) {
-    out.print("+-------------------------+");
+    String strip = strip(quantity + 1);
+    out.printf("+%s-%s+\n", strip, strip);
+  }
+
+  private String strip(int quantity) {
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < quantity; i++)
+      sb.append("-");
+
+    return sb.toString();
   }
 
   private void printTop(int quantity, PrintStream out) {
-    out.println("+-------------------------+"); // TODO: Сделать ширину каждого заголовка равной quantity
+    String strip = strip(quantity + 1);
+    out.printf("+%s-%s+\n", strip, strip); // TODO: Сделать ширину каждого заголовка равной quantity
     out.println("|     x     |     f(x)    |");
-    out.println("+-------------------------+");
+    out.printf("+%s-%s+\n", strip, strip);
   }
 }

intro/src/main/java/com/epam/courses/java/fundamentals/intro/practice/task4/MaxFinder.java

@@ -12,7 +12,13 @@ public MaxFinder(double... as) {
   }
 
   public double getMaximum() {
-    //todo реализовать!
-    return 0;
+    double maximum = Double.NEGATIVE_INFINITY;
+    for (int i = 0; i<as.length-1; i++){
+      double first = as[i];
+      double second = as[i+1];
+      double sum = first + second;
+      maximum = Math.max(maximum, sum);
+    }
+    return maximum;
   }
 }

intro/src/main/java/com/epam/courses/java/fundamentals/intro/practice/task5/CrossMatrix.java

@@ -9,8 +9,8 @@ public CrossMatrix(int size) {
   }
 
   public boolean get(int x, int y) {
-    //todo: реализовать!
-    return false;
+    return x+y == size - 1 || x == y;
+
   }
 
   @Override

intro/start.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
 mkdir -p target/classes
-#javac ...
-#java ...
+javac src/main/java/com/epam/courses/java/fundamentals/intro/practice/task1/*.java -d target/classes/
+java -cp target/classes/  com.epam.courses.java.fundamentals.intro.practice.task1.Main
+