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import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter the number of students: "); int num = input.nextInt(); int[] scores = new int[num]; int best = 0; System.out.print("Enter "+num+" scores: "); for(int i=0;i best) best=scores[i]; } char[] grades={ 'A','B','C','D'}; for(int i=0;i import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter ten integers: "); int[] nums = new int[10]; for(int i=0;i<10;i++) nums[i]=input.nextInt(); for(int i=9;i>=0;i--) System.out.print(nums[i]+" "); }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); int[] counts = new int[101]; for(int i=0;i<101;i++) counts[i]=0; System.out.print("Enter the integers between 1 and 100: "); while(true) { int tmp=input.nextInt(); counts[tmp]++; if(tmp==0) break; } for(int i=1;i<=100;i++) { if(counts[i]!=0) { if(counts[i]>1) System.out.printf("%d occurs %d times\n",i,counts[i]); else System.out.printf("%d occurs 1 time\n",i); } } }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); int[] occurs = new int[101]; int sum=0; int count = 0; while(true) { int tmp = input.nextInt(); if(tmp<0) break; occurs[tmp]++; sum+=tmp; count++; } double avg = 1.0*sum/count; int lower = 0; for(int i=0;i import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); int[] ass = new int[12]; int ptr = 0; System.out.print("Enter 10 numbers: "); for(int i=0;i<10;i++) { int tmp=input.nextInt(); boolean in = false; for(int j=0;j public class book { public static void main(String[] args) { int[] ass =new int[60]; ass[0]=2; int count=1; while(true) { if(count==50) break; else{ int base = ass[count-1]; while(true) { base++; if(isPrime(base,ass,count)) { ass[count]=base; count++; break; } } } } for(int i=0;i Math.sqrt(num)) break; if(num%dicks[i]==0) { re = false; break; } } return re; }} public class book { public static void main(String[] args) { int[] ass = new int[10]; for(int i=0;i<100;i++) ass[(int)(Math.random()*10)]++; for(int i=0;i<10;i++) System.out.printf("%d occurs %d times\n",i,ass[i]); }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter 10 doubles: "); double[] ass = new double[10]; for(int i=0;i<10;i++) ass[i]=input.nextDouble(); System.out.println("The average is "+average(ass)); } public static int average(int[] array) { int sum = 0; int len = array.length; for (int value : array) sum += value; return sum/len; } public static double average(double[] array) { double sum=0.0; int len = array.length; for(double ass : array) sum+=ass; return sum/len; }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter 10 doubles: "); double[] ass = new double[10]; for(int i=0;i<10;i++) ass[i]=input.nextDouble(); System.out.println("The minimum number is "+min(ass)); } public static double min(double[] array) { double ss = array[0]; for (double v : array) { if (v < ss) ss = v; } return ss; }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter 10 doubles: "); double[] ass = new double[10]; for(int i=0;i<10;i++) ass[i]=input.nextDouble(); System.out.println("The lowest index is "+indexOfSmallestElement(ass)); } public static int indexOfSmallestElement(double[] array) { int ss = 0; for(int i=0;i import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter 10 doubles: "); double[] ass = new double[10]; for(int i=0;i<10;i++) ass[i]=input.nextDouble(); System.out.println("The mean is "+mean(ass)); System.out.println("The standard deviation is "+deviation(ass)); } public static double deviation(double[] x) { double sum=0; double mean=mean(x); for(double v:x)sum+=Math.pow(v-mean,2); return Math.sqrt(sum/(x.length-1)); } public static double mean(double[] x) { double sum=0; for (double v : x) sum += v; return sum/x.length; }} import java.util.Scanner;public class book { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter 10 doubles: "); double[] ass = new double[10]; for(int i=0;i<10;i++) ass[i]=input.nextDouble(); reverse(ass); for(double v:ass) System.out.print(v+" "); } public static double[] reverse(double[] ass) { int len = ass.length; for(int i=0;i public class book { public static void main(String[] args) { System.out.println("The random number is "+getRandom(1,1,4,5,1,4,1,9,1,9,8,1,0)); } public static int getRandom(int... numbers) { int jb=(int)(Math.random()*54)+1; while(inArray(numbers,jb)) jb=(int)(Math.random()*54)+1; return jb; } public static boolean inArray (int[] ass,int dick) { for (int value : ass) { if (value == dick) return true; } return false; }} 转载地址：http://juwai.baihongyu.com/