Java经典习题33

/*
题目：打印出杨辉三角形（要求打印出10行如下图）
1              
1    1
1    2    1
 1    3    3    1 

*/
public class Class33 {

public static void main(String[] args) {
// TODO Auto-generated method stub
int[][] a = new int[10][10];
for(int i = 0; i < 10; i++){
a[i][i] = 1;
a[i][0] = 1;
}
for(int i = 2; i < 10; i++){
for(int j = 1; j < i; j++){
a[i][j] = a[i-1][j-1] + a[i-1][j];
}
}
for(int i = 0; i < 10; i++){
for(int k = 0; k < 2*(10-i)-1; k++){
System.out.print(" ");
}
for(int j = 0; j <= i; j++){
System.out.print(a[i][j] + " ");
}
System.out.println();
}

}

}