java/pisemka/Analyze.java.txt

   1 import java.io.*;
   2 import java.util.*;
   3 import java.lang.Math;
   4
   5 /** Pisemka - program "Analyze"
   6  * Copylefted by: Harvie 2oo9 ( http://blog.harvie.cz/ )
   7  * @author      Thomas Harvie Mudrunka (mudruto1)
   8  * @version     1.0
   9  */
  10 /* Priklad:
  11 Zadavej posloupnost ukoncenou zapornym cislem:
  12 1
  13 2
  14 3
  15 4
  16 5
  17 -1
  18 Byla zadana nasledujici rada:
  19 1.0; 2.0; 3.0; 4.0; 5.0;
  20 minimum = 1.0
  21 maximum = 5.0
  22 Cisla delitelna 3.0:
  23 3.0;
  24 prumer = 3,00
  25 Prvocisla:
  26 2.0; 3.0; 5.0;
  27 */
  28 class analyzator {
  29         private double[] seq = new double[101];
  30         private Scanner sc = new Scanner(System.in);
  31
  32         public boolean readSeq() {
  33                 System.out.println("Zadavej posloupnost ukoncenou zapornym cislem:");
  34                 int i;;
  35                 for(i=0;i<seq.length;i++) {
  36                         try {
  37                                 seq[i] = sc.nextDouble();
  38                         } catch(Exception e) {
  39                                 return false;
  40                         }
  41                         if(seq[i] < 0) break;
  42                 }
  43                 System.out.println("Byla zadana nasledujici rada:");
  44                 for(i=0;i<seq.length;i++) {
  45                         if(seq[i] < 0) break;
  46                         System.out.print(seq[i]+"; ");
  47                 }
  48                 System.out.println("");
  49                 return true;
  50         }
  51
  52         public void vypisMinimax() {
  53                 double min = seq[0], max = seq[0];
  54                 int i;
  55                 for(i=1;i<seq.length;i++) {
  56                         if(seq[i] < 0) break;
  57                         if(seq[i] < min) min = seq[i];
  58                         if(seq[i] > max) max = seq[i];
  59                 }
  60                 System.out.println("minimum = "+min);
  61                 System.out.println("maximum = "+max);
  62         }
  63
  64         public void vypisDelitelne(double a) {
  65                 System.out.println("Cisla delitelna "+a+":");
  66                 int i;
  67                 for(i=0;i<seq.length;i++) {
  68                         if(seq[i] < 0) break;
  69                         if((seq[i] % a) == 0) System.out.print(seq[i]+"; ");
  70                 }
  71     System.out.println("");
  72         }
  73
  74         public boolean jePrvocislo(double a) {
  75                 if(a <= 1) return false;
  76                 if(a == 2) return true;
  77                 if(a % 2 == 0) return false;
  78                 int i;
  79                 for(i = 3; i <= Math.sqrt(a); i += 2){
  80                         if(a % i == 0) return false;
  81                 }
  82                 return true;
  83         }
  84
  85         public void vypisPrvocisla() {
  86                 System.out.println("Prvocisla:");
  87                 int i;
  88                 for(i=0;i<seq.length;i++) {
  89                         if(seq[i] < 0) break;
  90                         if(jePrvocislo(seq[i])) System.out.print(seq[i]+"; ");
  91                 }
  92     System.out.println("");
  93         }
  94
  95         public void vypisPrumer() {
  96                 int i, max;
  97                 double avg = 0;
  98                 for(max=0;max<seq.length;max++) if(seq[max] < 0) break;
  99                 for(i=0;i<max;i++) avg += (seq[i]/max);
 100     System.out.printf("prumer = %.2f\n",avg);
 101         }
 102 }
 103
 104 public class Analyze {
 105         public static void main(String[] argv) {
 106                 //System.out.println("\n");
 107                 analyzator a = new analyzator();
 108                 if(!a.readSeq()) {
 109                         System.err.println("Neco je spatne.");
 110                         System.exit(1);
 111                 }
 112                 a.vypisMinimax();
 113                 a.vypisDelitelne(3);
 114                 a.vypisPrumer();
 115                 a.vypisPrvocisla();
 116         }
 117 }
 118
 119