[個人記錄]小白書學習1.1-1.4(算法競賽入門經典第一版)

package one;

import java.util.Scanner;

public class one_o {
 public static void main(String[] args) {
     /**
   *
   * 1.1算數表達式
   */
  /*System.out.printf("%d\n",1+2);
  System.out.printf("%d\n",3-4);
  System.out.printf("%d\n",5*6);
  System.out.printf("%d\n",8/4);
  System.out.printf("%d\n",8/5);
  System.out.printf("%.1f\n",8.0/5.0);
  System.out.printf("%.2f\n",8.0/5.0);
  //System.out.printf("%.1f\n",8/5);
  //System.out.printf("%d\n",8.0/5.0);
  System.out.printf("%.8f", 1+2*Math.sqrt(3)/(5-0.1));
  */
  /**
   * 1.2變量及其輸入
   * 
   */
  /*Scanner sc=new Scanner(System.in);
  int a=sc.nextInt();
  int b=sc.nextInt();
  System.out.println(a+b);*/
  //圓柱體表面積
  /*Scanner sc1=new Scanner(System.in);
  double r,h,s,s1,s2;
  r=sc1.nextDouble();
  h=sc1.nextDouble();
  s1=Math.PI*r*r;
  s2=2*Math.PI*h;
  s=2*s1+s2;
  System.out.printf("Area= %.3f",s);*/
  /**
   * 1.3順序結構程序設計
   */
  //三位數反轉(1)
  /*Scanner sc2=new Scanner(System.in);
  int n=sc2.nextInt();
  System.out.printf("%d%d%d",n%10,n/10%10,n/100);*/
  //三位數反轉(2)當最高位爲0時
  /*Scanner sc3=new Scanner(System.in);
  int n=sc3.nextInt();
  int m=(n%10)*100+(n/10%10)*10+(n/100);
  System.out.printf("%03d",m);*/
  //交換變量(1)三變量法
  /*Scanner sc4=new Scanner(System.in);
  int a=sc4.nextInt();
  int b=sc4.nextInt();
  int t;
  t=a;
  a=b;
  b=t;
  System.out.printf("%d %d",a,b);*/
  //變量交換(2)不建議
  /*Scanner sc5=new Scanner(System.in);
  int a=sc5.nextInt();
  int b=sc5.nextInt();
  a=a+b;
  b=a-b;
  a=a-b;
  System.out.printf("%d %d",a,b);*/
  //變量交換(3)最適合
  Scanner sc6=new Scanner(System.in);
  int a=sc6.nextInt();
  int b=sc6.nextInt();
  System.out.printf("%d %d",b,a);
 }
}
  /**
   * 1.4分支結構程序設計
   */
  //雞兔同籠
  /*int a,b,n,m;//雞、兔、總數、腿數
  Scanner sc7=new Scanner(System.in);
  n=sc7.nextInt();
  m=sc7.nextInt();
  a=(4*n-m)/2;
  b=n-a;
  if(m%2==1||a<0||b<0) {
   System.out.println("no answer");
  }
  else {
   System.out.printf("%d %d", a,b);
  }*/
  //三整數排序(2)
  /*int a,b,c;
  Scanner sc8=new Scanner(System.in);
  a=sc8.nextInt();
  b=sc8.nextInt();
  c=sc8.nextInt();
  if(a<=b && b<=c) System.out.printf("%d %d %d", a,b,c);
  else if(a<=c && c<=b) System.out.printf("%d %d %d", a,c,b);
  else if(b<=a && a<=c) System.out.printf("%d %d %d", b,a,c);
  else if(b<=c && c<=a) System.out.printf("%d %d %d", b,c,a);
  else if(c<=a && a<=b) System.out.printf("%d %d %d", c,a,b);
  else if(c<=b && b<=a) System.out.printf("%d %d %d", c,b,a);*/
  //三整數排序(3)
  /*int a,b,c,t;
  Scanner sc9=new Scanner(System.in);
  a=sc9.nextInt();
  b=sc9.nextInt();
  c=sc9.nextInt();
  if(a>b) {
   t=a;
   a=b;
   b=t;
  }
  if(a>c) {
   t=a;
   a=c;
   c=t;
  }
  if(b>c) {
   t=b;
   b=c;
   c=t;
  }
  System.out.printf("%d %d %d", a,b,c);*/
  //三整數排序(4) 推薦
  int a,b,c,x,y,z;
  Scanner sc10=new Scanner(System.in);
  a=sc10.nextInt();
  b=sc10.nextInt();
  c=sc10.nextInt();
  x=a;if(b<x) x=b;if(c<x) x=c;
  z=a;if(b>z) z=b;if(c>z) z=c;
  y=a+b+c-x-z;
  System.out.printf("%d %d %d",x,y,z);

算法競賽入門學習

一邊看書一邊將原文中的C語言改爲Java語言編寫