l 有30个0~9之间的数字,分别统计0~9这10个数字分别出现了多少次?
Public class TestArray { int score[]={0,0,1,2,3,5,4,5,2,8,7,6,9,5,4,8,3,1,0,2,4,8,7,9,5,2,1,2,3,9}; int num0=0; int num1=0; int num2=0; int num3=0; int num4=0; int num5=0; int num6=0; int num7=0; int num8=0; int num9=0; for (int i=0;i<score.length ;i++ ) { if (score[i]==9) { num9++; } if (score[i]==1) { num1++; } if (score[i]==2) { num2++; } if (score[i]==3) { num3++; } if (score[i]==4) { num4++; } if (score[i]==5) { num5++; } if (score[i]==6) { num6++; } if (score[i]==7) { num7++; } if (score[i]==8) { num8++; } if (score[i]==0) { num0++; } } System.out.println("0出现的次数:"+num0); System.out.println("1出现的次数:"+num1); System.out.println("2出现的次数:"+num2); System.out.println("3出现的次数:"+num3); System.out.println("4出现的次数:"+num4); System.out.println("5出现的次数:"+num5); System.out.println("6出现的次数:"+num6); System.out.println("7出现的次数:"+num7); System.out.println("8出现的次数:"+num8); System.out.println("9出现的次数:"+num9); }
l 定义一个整型数组,保存10个数据,利用程序完成将最大值保存在数组中的第1个元素且原第一个数换到最大值的位置!
public class TestArray01 { publicstatic void main(String agrs[]) { int score[]={55,45,5,44,2,6,56,15,4,12}; System.out.println("这10个数字:"); print(score); System.out.println(""); System.out.println("改变后的数字:"); add(score); } publicstatic void add(int score[]) { int max=score[0]; int arr[]=new int[score.length]; for (int i=0;i<score.length ;i++ ) { arr[i]=score[i]; if(max<arr[i]) { max=arr[i]; int temp=arr[0]; arr[0]=arr[i]; arr[i]=temp; } } for (int i=0;i<arr.length ;i++ ) { System.out.print(arr[i]+"、"); } } publicstatic void print(int arr[]) { for (int i=0;i<arr.length ;i++ ) { System.out.print(arr[i]+"、"); } } }
l 在排序好的数组中添加一个数字,将添加后的数字插入到数组合适的位置。
import java.util.Scanner; public class TestArray02 { public static void main(String agrs[]) { int score[]={5,10,20,40,42,100,500}; System.out.println("原数组为:"); print(score); System.out.println(""); System.out.println("输入要插入的数字"); Scanner scan=new Scanner(System.in); int x=scan.nextInt(); System.out.println("添加一个数字后,数组的排序为:"); add(x,score); } public static void print(int arr[]) { for (int i=0;i<arr.length ;i++ ) { System.out.print(arr[i]+"、"); } } public static void add(int y,int arr[]) { int one[]=new int[arr.length+1]; for (int i=0;i<arr.length ;i++ ) { one[i]=arr[i]; } one[one.length-1]=y; for (int i=1;i<one.length ;i++ ) { for (int j=0;j<one.length; j++ ) { if (one[i]<one[j]) { int temp=one[i]; one[i]=one[j]; one[j]=temp; } } } for (int i=0;i<one.length ;i++ ) { System.out.print(one[i]+"、"); } } }编写程序求1!+2!+.........30!的和并显示
Public class TestArray { public staticvoid main(String agrs[]) { double i=1; double sum=0; double s=1; for (i=1;i<=30 ;i++ ) { s=s*i; sum=sum+s; } System.out.print(sum); } }
l 定义一个由整数组成的数组,要求求出其中的奇数个数和偶数个数。
public class TestArray03 { public static void main(String agrs[]) { int n=0; int m=0; int score[]={12,125,22,5,7,6,8,11,20}; for (int i=0;i<score.length ;i++ ) { if (score[i]%2==0) { n++; }else { m++; } } System.out.println("偶数的个数:"+n); System.out.println("奇数的个数:"+m); } }
public class TestArray04 { public static void main(String agrs[]) { int oldArr[]={1,3,4,5,0,0,6,6,0,5,4,7,6,7,0,5}; int k=0; int num=0; for (int i=0;i<oldArr.length ;i++ ) { if (oldArr[i]==0) { num++; } } int newArr[]=new int[oldArr.length-num]; for (int i=0;i<oldArr.length ;i++ ) { if (oldArr[i]!=0) { newArr[k]=oldArr[i]; k++; } } for (int i=0;i<newArr.length ;i++ ) { System.out.print(newArr[i]+"、"); } } }
定义一个整型数组,求出数组元素的和、数组元素的最大值和最小值,并输出所求结果。
public class TestArray05 { public static void main(String agrs[]) { int score[]={22,11,33,15,23,12,14,55}; int k=0; int max=score[0]; int min=score[0]; for (int i=0;i<score.length ;i++ ) { k=k+score[i]; if (max<score[i]) { max=score[i]; } if (min>score[i]) { min=score[i]; } } System.out.println("数组的和:"+k); System.out.println("数组的最大数:"+max); System.out.println("数组的最小数:"+min); } }
l 给出10个整数(int型),然后任意查询一个数字是否存在该10个数字内
public class TestArray06 { public static void main(String[] args) { int score[]={11,12,33,15,55,45,66,65,78,88}; int sum=11; for (int i=0;i<score.length ;i++ ) { if (sum==score[i]) { System.out.print("sum是这10个数里的数为:"+sum); break; } else { System.out.print("sum不是这10个数里的数!"); break; } } } }
l 定义一个包含10个元素的数组,对其进行赋值,使每个元素的值等于其下标,然后输出;最后将这个数组倒置后输出
public class TestArray07 { public static void main(String[] args) { int score[]=new int[10]; int arr[]=new int[score.length]; System.out.println("数组改变前:"); for (int i=0;i<score.length ;i++ ) { score[i]=i; System.out.print(score[i]+"、"); } System.out.println("\n"+"数组改变后:"); for (int i=0;i<score.length ;i++ ) { arr[i]=score[i]; } for (int i=0;i<arr.length ;i++ ) { score[i]=arr[score.length-1-i]; System.out.print(score[i]+"、"); } } }
l 给出10个老师的打分,对10个老师的打分打到最高分
public class TestArray08 { public static void main(String[] args) { int score[]={100,33,15,95,11,23,54,23,45,86}; int max=score[0]; for (int i=0;i<score.length ;i++ ) { if (max<score[i]) { max=score[i]; } } System.out.println("老师打的最高分:"+max); } }