Java---- 5.1 使用循环打印九九乘法表

public class testNineNine {
//左下角乘法表
	public static void main(String[] args) {
		System.out.println("打印九九乘法表");
		//两层循环，外层控制行   内层控制列
		//左下角乘法表 
		for( int i = 1 ; i <= 9 ; i++ ) {
			
			for( int j = 1 ; j <= i ; j++ ) {  // 当i = j时停止
				System.out.print( j + " x " + i + " = " + i * j + "t");
			}
			System.out.println();
		}
	}
}

//左上角乘法表 
		for( int i = 1 ; i <= 9 ; i++ ) {
			
			for( int j = 9 ; j >= i ; j-- ) {
				System.out.print( j + " x " + i + " = " + i * j + "t");
				
			}
			System.out.println();		
		}

//右上角乘法表 
		for( int i = 9 ; i >= 1 ; i-- ) {
			for( int j = 9 ; j >= 1 ; j-- ) {
				if( j > i ) {
					System.out.print("t");
				} else {
					System.out.print( i + "x" + j + "=" + i * j + "t");
				}
			}
			System.out.println();		
		}

//右下角乘法表 
		for( int i = 1 ; i <= 9 ; i++ ) {
			for(int t = 1;t<=9-i;t++) {
				System.out.print("t");
			}
			for( int j = 1 ; j <= i ; j++ ) {
				System.out.print( i + "x" + j + "=" + i * j + "t");
			}
			System.out.println();		
		}