print $F[0] + $F[-2]; # offset -2 means "2nd to last element of the array" } 另一个常见任务是打印两个标记之间或两个行号之间的文件内容。 # 1. just lines 15 to 17 perl -ne 'print if 15 .. 17' # 2. just lines NOT between line 10 and 20 perl -ne 'print unless 10 .....
Perl - How to get the last element of an array and show, How do I get the last element of an array and show the rest of the elements? Like this : @myArray = (1,1,1,1,1,2); Expected output : SomeVariable1 = 11111 SomeVariable2 = 2 Browse other questions tagged arrays perl ...
Shift() removes the first element out of an array, unshift() adds elements to the beginning of an array. @array=qw#dino fred barney#; $m=shift(@array); # $m is 'dino', @array now is ('fred', 'barney') $n=shift @array; # $n is 'fred', @array now is ('barney') shift ...
There are two ways to directly get the last element of an array: $rocks[$#rocks]='hard rock'; $rocks[-1]='hard rock'; $#rocks is the index of last element, both above ways are correct, but [-1] is more popular ^_^ list/array can be writen in ( ), split by ',' between ...
unshift(@myarray,'000'); print"@myarray\n"; delete $myarray[1]; print "@myarray\n" ; 2)函数,如下: 3)注释: 1】使用@定义array,使用array的item时$array[n]; 2】使用scalar来获得array的size; 3】$#获得最大的index,即size-1;
There are two ways to directly get the last element of an array: $rocks[$#rocks]='hard rock'; $rocks[-1]='hard rock'; $#rocks is the index of last element, both above ways are correct, but [-1] is more popular ^_^ list/array can be writen in ( ), split by ',' between...
# add one element at the end of the array push(@coins, "Penny"); print "2.\@coins =@coins\n"; # add one element at the beginning of the array unshift(@coins, "Dollar"); print "3.\@coins =@coins\n"; # remove one element from the last of the array. ...
The pop function will remove and return the last element of an array. In this first example you can see how, given an array of 3 elements, the pop function removes the last element (the one with the highest index) and returns it. ...
print $F[0] + $F[-2]; # offset -2 means "2nd to last element of the array" } 另一个常见任务是打印两个标记之间或两个行号之间的文件内容。 清单3:打印一系列行 # 1. just lines 15 to 17 perl -ne 'print if 15 .. 17'
print "Every Element of Array muls 2 by foreach \n"; @a=(1..10); foreach $_(@a){$_*=2;} print join (", ",@a); print "\n---END---\n"; print "Every Element of Array muls 2 by map \n"; @a=(1..10); map{$_*=2;} (@a); print ...