ccsun3 testjava >  cat -n mySecondJava.java
     1	// mySecondJava.java  -- CopyLeft by tsaiwn@csie.nctu.edu.tw
     2	// please compare to p7.c in our C/C++ handouts
     3	// Java 程式也是個 class, 按習慣該以大寫開頭, 但不按習慣也是會動...
     4	// 何時該寫 static function?
     5	// 不是 static 的 function 使用時須依附著 object, 例 x.function();
     6	//*** Pascal Triangle 是用來暸解array很好的例子
     7	//////
     8	public class mySecondJava {
     9	   static int MAXorder = 14;
    10	   private static void somespace(int k){
    11	      if(k<10) System.out.print("    ");
    12	      else if(k<100) System.out.print("   ");
    13	      else System.out.print("  ");
    14	   }
    15	   public static void main( String p[]) {
    16	      int i,j,k;
    17	      int n;
    18	      int x[][] = new  int[MAXorder+1][MAXorder+1];
    19	      System.out.print("Generate 巴斯卡三角形, order=?");
    20	      n = myScanf();
    21	      while( !(3<=n &&  n<=MAXorder)) {
    22	         System.out.print(" order must be in 3.." + MAXorder);
    23	         System.out.print(", order=?");
    24	         n = myScanf();
    25	      }
    26	      System.out.println("");
    27	      for(i=0; i<=n; i++){
    28	          x[i][0]=1; x[i][i] =1;
    29	          for(j=1; j<= i-1; j++){
    30	             x[i][j]= x[i-1][j] + x[i-1][j-1];
    31	          }
    32	          for(j =0; j<=i; j++){
    33	             somespace(x[i][j]);
    34	             System.out.print(x[i][j]);
    35	          };
    36	          System.out.println("");
    37	      }; //* for i 
    38	      return;
    39	   }
    40	   public static int myScanf(){
    41	      int c, ans, i, nc, NEWLINE=10, ZERO= (int) '0', NINE=(int)'9';
    42	      int b[] = new int[88];
    43	      i=0;
    44	      try{
    45	         c = System.in.read();   // one byte each time
    46	         while(c != NEWLINE){
    47	            b[i++] = c;
    48	            c = System.in.read();
    49	         }
    50	         nc = i + 1;
    51	         ans= b[0] - ZERO;
    52	         for(i=1; i< nc; i++){
    53	            if(b[i]<ZERO || b[i] > NINE) break;
    54	            ans = ans*10 + b[i] - ZERO;
    55	         }
    56	         return ans;
    57	      } catch(java.io.IOException e){ return 0; }
    58	   }
    59	}
ccsun3 testjava > /usr/local/jdk/jdk1.2.2/bin/javac mySecondJava.java
ccsun3 testjava > /usr/local/jdk/jdk1.2.2/bin/java mySecondJava
Generate 巴斯卡三角形, order=?19
 order must be in 3..14, order=?8

    1
    1    1
    1    2    1
    1    3    3    1
    1    4    6    4    1
    1    5   10   10    5    1
    1    6   15   20   15    6    1
    1    7   21   35   35   21    7    1
    1    8   28   56   70   56   28    8    1
ccsun3 testjava >