菜鸟(九九、取各位数值,字母金字塔,阶层)

package com.text;

import java.util.*;

public class daoxu {

/**
* @param args
*/
public static void main(String[] args)  {
// TODO Auto-generated method stub
Scanner input=new Scanner(System. in); 
取各个位数数字
int a=1234,c=0,b=0,d=0;
c=a/1000;
b=(a-c*1000)/100;
d=(a-(c*1000+b*100))/10;
a=a%10;
System.out.print(a+"\n"+d+"\n"+b+"\n"+c);
------------------------------
1到15的阶层
int num=1234;
int Array[]=new int[];
int  s =1;
double cc=0,kk=0,tem=1;
for(int i=1;i<16;i++){
for(int j=1;j<=i;j++){
s*=j;

}
kk+=s;

}
System.out.println(kk);
-------------------------------------------
九九乘法表
int c=0;
for(int i=1;i<10;i++){
for(int j=1;j<=i;j++){
c=j*i;
if(c<10){
System.out.print(j+"*"+i+"="+" "+c+"\t");
}
else{
System.out.print(j+"*"+i+"="+c+"\t");
}
方法二： System.out.print(j+"*"+i+"="+(c<10?" "+c:c)+"\t");
}
System.out.println("");
}
---------------------------------

// 字母金字塔
int n=input.nextInt();
char ch = 'A';

for(int i = 1;i <= n;i++){
if(i == 1){
for(int j = 1;j <= 2*(n - i) - 1;j++){
System.out.print(" ");
}
}else{
for(int j = 1;j <= 2*(n - i);j++){
System.out.print(" ");
}
}

if(i == 1){
System.out.print(ch);
}else{
for(int k = 1;k <=2*(i - 1);k++){
System.out.print(ch + " ");
}
}

System.out.println();

ch++;
}
}

}