打印金字塔数字

public class tt {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int i, j, k;
for (i = 0; i < 8; i++) {
for (j = 0; j < 7 - i; j++) {
System.out.print("     ");
}
for (k = 0; k < 2 * i + 1; k++) {
if (k <= i) {
System.out.printf("%5d", (int) Math.pow(2, k));
} else
System.out.printf("%5d", (int) Math.pow(2, 2 * i - k));
}
System.out.println();
}
}

}