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#!/usr/bin/perl $a = "abc"; $b = "xyz"; print "\$a = $a ,\$b = $b\n"; if( $a lt $b ){ print "$a lt \$b 返回 true\n"; }else{ print "\$a lt \$b 返回 false\n"; } if( $a gt $b ){ print "\$a gt \$b 返回 true\n"; }else{ print "\$a gt \$b 返回 false\n"; } if( $a le $b ){ print "\$a le \$b 返回 true\n"; }else{ print "\$a le \$b 返回 false\n"; } if( $a ge $b ){ print "\$a ge \$b 返回 true\n"; }else{ print "\$a ge \$b 返回 false\n"; } if( $a ne $b ){ print "\$a ne \$b 返回 true\n"; }else{ print "\$a ne \$b 返回 false\n"; } $c = $a cmp $b; print "\$a cmp \$b 返回 $c\n";
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