}else{print"two arrays are not equal\n"; } } 3.使用 模块 #!/usr/bin/perlusestrict;useArray::Compare;my@array1=1..10;my@array2=1..11;my@array3=1..10;print"compare array1 and array2\n";&check(\@array1,\@array2);print"
Q #11) Explain string comparison operators in Perl. Answer:Perl supports various string operators as shown below: EqualityOperators Equaleq Not Equalne Comparisoncmp Less thanlt Greater thangt Less than or equalle Greater than or equalge These operators can be used to compare two strings. Q #...
= inequality < less than > greater than <= less than or equal >= greater than or equal String comparison eq equality ne inequality lt less than gt greater than le less than or equal ge greater than or equal (Why do we have separate numeric and string comparisons? Because we don't ...
compare(1) composite(1) compress(1) config.guess(1) config.sub(1) config_data(1) conflict(1) conjure(1) constype(1) continue(1) convert(1) convmv(1) corelist(1) cp(1) cp(1g) cpack(1) cpan(1) cpan2dist(1) cpanp(1) cpio(1) cpp(1) cpp(1) cputrack(1) crle(1) cronta...
always true. If the result of this statement is0or “” (the empty string),testis considered to be false; everything else is true. Variables that have not been assigned a value, either withDEFAULTorSET, are considered to be false (the value of an undefined variable is an empty string)...
https://en.cppreference.com/w/cpp/string/byte/toupper says no 2^32 or 2^64 abuse If the value of ch is not representable as unsigned char and does not equal [EOF] , the behavior is undefined. As you and me both agreed on IRC, there is some really poor quality Win32 only code...
panic% perl -e 'open F, "/does_not_exist" || die "cannot open the file"' Nothing happens! The pitfall lies in the precedence of the || operator. The above call is equal to: panic% perl -e 'open F, ("/does_not_exist" || die "cannot open the file")' where the left part...
Strings written in this form are also useful to represent version ``numbers''. It is easy to compare such version ``numbers'' (which are really just plain strings) using any of the usual string comparison operators"eq","ne","lt","gt", etc., or perform bitwise string operations on the...
use Data::Compare; # Note: CPAN module, not core if( Compare( $ref1, $ref2 ) ){ ... } (= num1 num2) (string= str1 str2) (eq emacs_object1 emacs_object2) ;; same object (if (equal structure1 structure2) ( ... ) ...
type Equal Not Equal compare Less than Greater than 数值比较 1+3==4 $b != 6 $a<=>$b 1<2 $a>3 字符串比较 $a eq ‘\n’ $b ne ‘a’ $a cmp $b ‘a’ lt ‘b’ ‘3’ gt ’12’ 课外参考 网上的Perl 5 教程(by flamephoenix) Perl的文档 Resource The best ...