$array[0] = a; Sets the first element of @array to a @array[3..5] Array slice - returns a list containing the 3rd thru 5th elements of @array scalar(@array) Returns the number of elements in @array $#array The index of the last element in @array grep(/pattern/, @array) Return...
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 .....
In Perl, arrays are represented by an @ before the variable, but in Option 2 above, we use a $# prefix, which accesses the index of the last element of an array. We use $# in Option 4 but use the keyword scalar in Option 3. The scalar keyword returns the number of elements in...
print $F[0] + $F[-2]; # offset -2 means "2nd to last element of the array" } 另一个常见任务是打印两个标记之间或两个行号之间的文件内容。 清单3:打印一系列行 # 1. just lines 15 to 17 perl -ne 'print if 15 .. 17' # 2. just lines NOT between line 10 and 20 perl -ne '...
The length of an array is a scalar value. You may find the length of array@daysby evaluating$#days, as incsh. However, this isn't the length of the array; it's the subscript of the last element, which is a different value since there is ordinarily a 0th element. Assigning to$#da...
Explanation:In the above example, we have access array element of array11, array22, months and array 33. Types of Array in Perl Below are the types of an array that are as follows. Pop Shift Push Unshift Splice 1. Pop The pop array is removed from the last element of an array. Belo...
foreach() can go through all elements of an array and produce a loop. foreach $rock (qw/bedrock slate lava/){ print "One rock is $rock.\n"; } The contral variable $rock get an element every time it loops, until the last element it ends. ...
If 'return' doesn't happen (ex: false condition), then the last expression returns. my @names=qw/fred barney betty dino Wilama pebbles bam-bamm/; my $result=&which_element_is("dino", @names); sub which_element_is{ my($what,@array)=@_; ...
# 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. ...
以下是一个示例,演示如何使用数组和遍历数组: package main import "fmt" func main() { // 声明并初始化一个包含5个整数的数组 myArray...("Element at index %d: %d\n", i, myArray[i]) } } 这个示例创建了一个包含5个整数的数组,并使用for循环遍历数组元素,并打印出每个元素的值和索引。......