print"found match!\n"if@array~~/xyz/; 没有必要再逐个元素进行匹配了。 案例四,普通比较 ~~还能代替普通的比较操作符,我们知道,在perl中,数字比相等较用==,字符串相等比较用eq,有了~~,就不必考虑类型问题了,它会根据待比较的数选择合适的操作符进行比较的 print"number equal\n"if1~~2; print"string ...
5|0die/unless #die 强制异常退出, 并作为error msgdie("error happend");#还可以配合unless实现python中assertion的作用die("file $file_path is not found.")unless(-e$file_path);#-e用于确定文件是否存在,-d用于确定文件夹是否存在# 如果$file_path存在则不抛出error 6|0条件语句 6|1if-else if($va...
$n=1; if($n<0){ print "$n is a negative number.\n" } 语句修饰词 print "$n is a negative number.\n" if $n<0;#语句修饰词 条件修饰词: if ;unless 循环修饰词 :while ;until; foreach 4.循环控制 last:提前结束全部循环,等同于“break” next:提前进入到下一次循环,等同于“continue”...
The int() function has been used to convert the input value into the number before comparing the values. The “if-else” statement has been used here to check whether the input numbers are equal or not. # Take the number inputs from the user print "Enter the first number:"; $value1...
If either operand of scalar ".." is a constant expression, that operand is considered true if it is equal (== ) to the current input line number (the $. variable).To be pedantic, the comparison is actually int(EXPR) == int(EXPR) , but that is only an issue if you use a ...
Binary "ne" returns true if the left argument is stringwise not equal to the right argument. Binary "cmp" returns -1, 0, or 1 depending on whether the left argument is stringwise less than, equal to, or greater than the right argument. Bitwise...
if (!defined $sig_def || $sig_def !~ /sig\_${msb}\_0/) { $sig_def .= "reg [$msb:0] ${cur_sig_def};\n" } # if ($src_num != $chk_num) { # print "${tab}${tab}${ERROR} the bit number between $src_sig and $chk_sig is different. Exiting...\n\n"; ...
"while/if BLOCK BLOCK" gone, "**" binds tighter than unary minus, "foreach" changed when iterating over a list, "split" with no args behavior changed, -e behavior fixed, "push" returns number of elements in resulting list, Some error messages differ, "split()" honors subroutine args,...
Returns Ture if the two operands are not equal, False otherwise.Returns Ture if the two operands are not equal, False otherwise. <=<= Returns Ture if the operand on the left is numerically less than or equal to the operand on the right of the operator. Returns False otherwise.Returns Tur...
print "$var1 and $var2 are not equal!n"; } print "using operator ==n"; if ( $var1 == $var2 ) { print "$var1 and $var2 are equal!n"; } else { print "$var1 and $var2 are not equal!n"; } 这些运算符之间的差异是Perl中非常常见的混淆源。