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Perl语言入门(第8版)
book

Perl语言入门(第8版)

by Randal L. Schwartz, brian d foy, Tom Phoenix
October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Southeast University Press
Content preview from Perl语言入门(第8版)
310
附录
A
@names = qw/ fred betty barney dino wilma pebbles bamm-bamm /;
print "Enter some numbers from 1 to 7, one per line, then press Ctrl-D:\n";
chomp(@numbers = <STDIN>);
foreach (@numbers) {
print "$names[ $_ - 1 ]\n";
}
因为数组索引是从
0
数到
6
,所以这里必须将索引值减
1
,好让用户能够从
1
7
。另外一种做法是在
@names
数组前面加上一个值来充数,像这样:
@names = qw/ dummy_item fred betty barney dino wilma pebbles bamm-bamm /;
如果你还额外检查了用户的输入是否在
1
7
的范围内,请给自己加分。
3.
如果想让所有的输出结果均显示在同一行,下面是实现方法之一:
chomp(@lines = <STDIN>);
@sorted = sort @lines;
print "@sorted\n";
或者,让每行分开显示:
print sort <STDIN>;
4
章习题解答
1.
下面是实现方法之一:
sub total {
my $sum; #
私有变量
foreach (@_) {
$sum += $_;
}
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Perl语言入门

Perl语言入门

Randal L. Schwartz, brian d foy, Tom Phoenix

Publisher Resources

ISBN: 9787576602036