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2023-12-01

假设变量$ a保持10，变量$ b保持20，然后下面是Perl中可用的赋值运算符及其用法 -

Sr.No.	操作符和说明
1	= 简单赋值运算符，将右侧操作数的值分配给左侧操作数 Example - $ c = $ a + $ b将$ a + $ b的值分配给$ c
2	+= 添加AND赋值运算符，它将右操作数添加到左操作数并将结果赋给左操作数 Example - $ c + = $ a相当于$ c = $ c + $ a
3	-= 减去AND赋值运算符，它从左操作数中减去右操作数，并将结果赋给左操作数 Example - $ c - = $ a相当于$ c = $ c - $ a
4	= 乘以AND赋值运算符，它将右操作数与左操作数相乘，并将结果赋值给左操作数 Example* - $ c * = $ a相当于$ c = $ c * $ a
5	/= 除法AND赋值运算符，它将左操作数除以右操作数，并将结果赋值给左操作数 Example - $ c/= $ a相当于$ c = $ c/$ a
6	%= 模数AND赋值运算符，使用两个操作数获取模数，并将结果赋给左操作数 Example - $ c％= $ a相当于$ c = $ c％a
7	= 指数AND赋值运算符，对运算符执行指数（幂）计算并将值赋给左操作数 Example - $ c = $ a相当于$ c = $ c ** $ a

例子 (Example)

尝试以下示例以了解Perl中可用的所有赋值运算符。将以下Perl程序复制并粘贴到test.pl文件中并执行该程序。

#!/usr/local/bin/perl
$a = 10;
$b = 20;
print "Value of \$a = $a and value of \$b = $b\n";
$c = $a + $b;
print "After assignment value of \$c = $c\n";
$c += $a;
print "Value of \$c = $c after statement \$c += \$a\n";
$c -= $a;
print "Value of \$c = $c after statement \$c -= \$a\n";
$c *= $a;
print "Value of \$c = $c after statement \$c *= \$a\n";
$c /= $a;
print "Value of \$c = $c after statement \$c /= \$a\n";
$c %= $a;
print "Value of \$c = $c after statement \$c %= \$a\n";
$c = 2;
$a = 4;
print "Value of \$a = $a and value of \$c = $c\n";
$c **= $a;
print "Value of \$c = $c after statement \$c **= \$a\n";

执行上述代码时，会产生以下结果 -

Value of $a = 10 and value of $b = 20
After assignment value of $c = 30
Value of $c = 40 after statement $c += $a
Value of $c = 30 after statement $c -= $a
Value of $c = 300 after statement $c *= $a
Value of $c = 30 after statement $c /= $a
Value of $c = 0 after statement $c %= $a
Value of $a = 4 and value of $c = 2
Value of $c = 16 after statement $c **= $a