【PHP/演習問題】continue文[1]

【PHP/演習問題】continue文[1]

問題

九九を出力するプログラムを作成してください。
なお、下記条件を満たすものとします。

  • for文を使う。
  • 4の数値を使う計算はスキップする
-- 1の段 --
1 × 1 = 1
1 × 2 = 2
1 × 3 = 3
1 × 5 = 5
1 × 6 = 6
1 × 7 = 7
1 × 8 = 8
1 × 9 = 9

-- 2の段 --
2 × 1 = 2
2 × 2 = 4
2 × 3 = 6
2 × 5 = 10
2 × 6 = 12
2 × 7 = 14
2 × 8 = 16
2 × 9 = 18

-- 3の段 --
3 × 1 = 3
3 × 2 = 6
3 × 3 = 9
3 × 5 = 15
3 × 6 = 18
3 × 7 = 21
3 × 8 = 24
3 × 9 = 27

-- 5の段 --
5 × 1 = 5
5 × 2 = 10
5 × 3 = 15
5 × 5 = 25
5 × 6 = 30
5 × 7 = 35
5 × 8 = 40
5 × 9 = 45

-- 6の段 --
6 × 1 = 6
6 × 2 = 12
6 × 3 = 18
6 × 5 = 30
6 × 6 = 36
6 × 7 = 42
6 × 8 = 48
6 × 9 = 54

-- 7の段 --
7 × 1 = 7
7 × 2 = 14
7 × 3 = 21
7 × 5 = 35
7 × 6 = 42
7 × 7 = 49
7 × 8 = 56
7 × 9 = 63

-- 8の段 --
8 × 1 = 8
8 × 2 = 16
8 × 3 = 24
8 × 5 = 40
8 × 6 = 48
8 × 7 = 56
8 × 8 = 64
8 × 9 = 72

-- 9の段 --
9 × 1 = 9
9 × 2 = 18
9 × 3 = 27
9 × 5 = 45
9 × 6 = 54
9 × 7 = 63
9 × 8 = 72
9 × 9 = 81

解答例

<?php

for( $i = 1; $i <= 9; $i++ ) {
    
    if( $i == 4 ) {
        continue;
    }
    
    echo "-- ".$i."の段 --\n";
    for( $j = 1; $j <=9 ; $j++ ) {
        
        if( $j == 4 ) {
            continue;
        }
        
        echo $i.' × '.$j.' = '.( $i *  $j )."\n";
    }
    echo "\n";
}

?>