php使用while,do-while,for循环打印99乘法表

2020-07-04 重庆LiSEO工作室

php使用while,do-while,for循环打印99乘法表，源码如下：

<?php
//while
echo "使用while循环打印1到9的乘法表<br>";
$a=1;
while($a<=9){
	$b=1;
	while($b<=$a){
		echo "$a X $b = ".($a*$b).'&nbsp;&nbsp;';
		$b++;
	}
	$a++;
	echo '<br>';
}

//do while
echo "使用do while循环打印1到9的乘法表<br>";
$a=1;
do{
	$b=1;
	do{
		echo "$a X $b = ".($a*$b).'&nbsp;&nbsp;';
		$b++;
	} while($b<=$a);
	$a++;
	echo '<br>';
}while($a<=9);

//for
echo "使用for循环打印1到9的乘法表<br>";
for($a=1;$a<=9;$a++){
	for($b=1;$b<=$a;$b++){
		echo "$a X $b = ".($a*$b).'&nbsp;&nbsp;';
	}
	echo '<br>';
}
?>

运行结果如下：

使用while循环打印1到9的乘法表
1 X 1 = 1  
2 X 1 = 2  2 X 2 = 4  
3 X 1 = 3  3 X 2 = 6  3 X 3 = 9  
4 X 1 = 4  4 X 2 = 8  4 X 3 = 12  4 X 4 = 16  
5 X 1 = 5  5 X 2 = 10  5 X 3 = 15  5 X 4 = 20  5 X 5 = 25  
6 X 1 = 6  6 X 2 = 12  6 X 3 = 18  6 X 4 = 24  6 X 5 = 30  6 X 6 = 36  
7 X 1 = 7  7 X 2 = 14  7 X 3 = 21  7 X 4 = 28  7 X 5 = 35  7 X 6 = 42  7 X 7 = 49  
8 X 1 = 8  8 X 2 = 16  8 X 3 = 24  8 X 4 = 32  8 X 5 = 40  8 X 6 = 48  8 X 7 = 56  8 X 8 = 64  
9 X 1 = 9  9 X 2 = 18  9 X 3 = 27  9 X 4 = 36  9 X 5 = 45  9 X 6 = 54  9 X 7 = 63  9 X 8 = 72  9 X 9 = 81  
使用do while循环打印1到9的乘法表
1 X 1 = 1  
2 X 1 = 2  2 X 2 = 4  
3 X 1 = 3  3 X 2 = 6  3 X 3 = 9  
4 X 1 = 4  4 X 2 = 8  4 X 3 = 12  4 X 4 = 16  
5 X 1 = 5  5 X 2 = 10  5 X 3 = 15  5 X 4 = 20  5 X 5 = 25  
6 X 1 = 6  6 X 2 = 12  6 X 3 = 18  6 X 4 = 24  6 X 5 = 30  6 X 6 = 36  
7 X 1 = 7  7 X 2 = 14  7 X 3 = 21  7 X 4 = 28  7 X 5 = 35  7 X 6 = 42  7 X 7 = 49  
8 X 1 = 8  8 X 2 = 16  8 X 3 = 24  8 X 4 = 32  8 X 5 = 40  8 X 6 = 48  8 X 7 = 56  8 X 8 = 64  
9 X 1 = 9  9 X 2 = 18  9 X 3 = 27  9 X 4 = 36  9 X 5 = 45  9 X 6 = 54  9 X 7 = 63  9 X 8 = 72  9 X 9 = 81  
使用for循环打印1到9的乘法表
1 X 1 = 1  
2 X 1 = 2  2 X 2 = 4  
3 X 1 = 3  3 X 2 = 6  3 X 3 = 9  
4 X 1 = 4  4 X 2 = 8  4 X 3 = 12  4 X 4 = 16  
5 X 1 = 5  5 X 2 = 10  5 X 3 = 15  5 X 4 = 20  5 X 5 = 25  
6 X 1 = 6  6 X 2 = 12  6 X 3 = 18  6 X 4 = 24  6 X 5 = 30  6 X 6 = 36  
7 X 1 = 7  7 X 2 = 14  7 X 3 = 21  7 X 4 = 28  7 X 5 = 35  7 X 6 = 42  7 X 7 = 49  
8 X 1 = 8  8 X 2 = 16  8 X 3 = 24  8 X 4 = 32  8 X 5 = 40  8 X 6 = 48  8 X 7 = 56  8 X 8 = 64  
9 X 1 = 9  9 X 2 = 18  9 X 3 = 27  9 X 4 = 36  9 X 5 = 45  9 X 6 = 54  9 X 7 = 63  9 X 8 = 72  9 X 9 = 81