九九乘方表/数组排序/反向输出字符串

<span style="font-size: 18px;">//格式4 * 3 * 2 * 1 = 24</span>

<span style="font-size: 18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">从零到九相加为13的数</span>

<span style="font-size: 18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">九九乘方表</span>

<span style="font-size: 18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">数组排序</span>

<span style="font-size: 18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">反向输出字符串</span>

<span style="font-size:18px;">import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner inRecurrence =new Scanner(System.in);
System.out.println("请输入您需要计算成绩的起始数,回车结束 ：");
long n = recurrence(inRecurrence.nextInt());
System.out.println(n);
getForString();
printString();

Scanner inShuzu =new Scanner(System.in);

int[] shuzu=new int[3];
System.out.println("请输入3个数比较");
for(int i=0;i<shuzu.length;i++){
shuzu[i]=inShuzu.nextInt();
}
compute(shuzu);
Scanner zifuchuan =new Scanner(System.in);
System.out.println("请输入反向输出的字符串");
getString(zifuchuan.nextLine());
}
//格式4 * 3 * 2 * 1 = 24
private static long recurrence(int n){
if(n == 1){
System.out.print("1 = ");
return 1;
}else{
System.out.print(n+" * ");
return n * recurrence(n -1);
}
}</span>

<span style="font-size:18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">从零到九相加为13的数</span><span style="font-size:18px;">
private static void getForString(){
System.out.println("从零到九相加为13的数：");
for(int a=0 ; a<=9 ; a++){
for(int b=0; b<=9 ; b ++){
if(a+b == 13){
System.out.println("a="+a+" "+"b="+b+" ");
}
}
}
}</span>

<span style="font-size:18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">九九乘方表</span><span style="font-size:18px;">
private static void printString(){
System.out.println("九九乘方表:");
for(int i = 1; i <= 9 ; i ++){
for(int j = 1 ; j <= i; j ++){
System.out.print(j+"*"+i+"="+i*j+"  ");
}
System.out.println();
}
System.out.println("九九乘方表已经结束！");
}
//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">数组排序</span><span style="font-size:18px;">
private static int compute(int[] in){
System.out.println("数组排序：");
int temp = 0;
for(int i = 0; i < in.length ; i ++){
for(int j = 0 ; j < in.length  ; j ++){
if(in[i] > in[j]){
temp = in[i];
in[i] = in[j];
in[j] = temp;
}
}
}
for(int k = 0 ; k < in.length ; k ++){
System.out.print(in[k] + ",");
}
System.out.println("排序结束！");
return Math.abs(in[0] - in[in.length - 1]);
}	</span>

<span style="font-size:18px;">//</span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">反向输出字符串</span><span style="font-size:18px;">
private static void getString(String str){
System.out.println("反向输出字符串！");
if(str != null && !str.isEmpty()){
for(int i = str.length() - 1; i >= 0; i-- ){
System.out.print(str.charAt(i));
}
}
}
}
</span>

<span style="font-size:18px;">请输入您需要计算成绩的起始数,回车结束 ：
4
4 * 3 * 2 * 1 = 24
从零到九相加为13的数：
a=4 b=9
a=5 b=8
a=6 b=7
a=7 b=6
a=8 b=5
a=9 b=4
九九乘方表:
1*1=1
1*2=2  2*2=4
1*3=3  2*3=6  3*3=9
1*4=4  2*4=8  3*4=12  4*4=16
1*5=5  2*5=10  3*5=15  4*5=20  5*5=25
1*6=6  2*6=12  3*6=18  4*6=24  5*6=30  6*6=36
1*7=7  2*7=14  3*7=21  4*7=28  5*7=35  6*7=42  7*7=49
1*8=8  2*8=16  3*8=24  4*8=32  5*8=40  6*8=48  7*8=56  8*8=64
1*9=9  2*9=18  3*9=27  4*9=36  5*9=45  6*9=54  7*9=63  8*9=72  9*9=81
九九乘方表已经结束！
请输入3个数比较
3 6 8
数组排序：
8,6,3,排序结束！
sdee333
反向输出字符串！
333eeds</span>