數值變數交換常用方法

echo "\n---臨時變數法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$tmp  = $num1;
$num1 = $num2;
$num2 = $tmp;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---臨時變數法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

echo "\n---加減法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$num1 = $num1 + $num2;
$num2 = $num1 - $num2;
$num1 = $num1 - $num2;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---加減法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

echo "\n---異或法---\n";

$num1 = 3;
$num2 = 6;
echo "交換前：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
$num1 = $num1 ^ $num2;
$num2 = $num1 ^ $num2;
$num1 = $num1 ^ $num2;
echo "交換後：\n", '$num1 = ', $num1, "\n", '$num2 = ', $num2, "\n";
/*---異或法---
交換前：
$num1 = 3
$num2 = 6
交換後：
$num1 = 6
$num2 = 3
*/

交換變數方法

1.第一種寫法 建議使用這種最好 1 int temp num1 2 num1 num2 3 num2 temp 2.第二種寫法 1 num1 num1 num2 2 num2 num1 num2 3 num1 num1 num2 3.第三種寫法 1 num1 num1 num2 2 num2 nu...

通過異或交換變數的數值

通過異或交換變數的數值，最我最為推薦的swap方法，相比 借用第三變數，temp a a b b temp 異或交換 更有效率！利用加減法，a a b b a b a a b 異或交換 適用範圍更廣。這裡的適用範圍更廣，說得有點牽強。加減法給我的直觀感覺是 不安全，當 a a b 的結果超出了該變數...

交換變數（簡便方法）

variable1 input 請輸入第乙個變數 variable2 input 請輸入第二個變數 variable3 variable2 variable2 variable1 variable1 variable3 print 第乙個變數是 variable1 print 第二個變數是 vari...