[英]How do I pass multiple arrays to a 'foreach' loop in Perl?
I want to write items from two arrays into a file, like 我想把两个数组中的项目写入文件,比如
@a = ('1', '2', '3')
@b = ('0.1', '0.2', '0.3')
I want my output like this: 我希望我的输出像这样:
1 0.1
2 0.2
3 0.3
in the file. 在文件中。
I tried using two foreach
loops, which is obviously wrong, 我尝试使用两个
foreach
循环,这显然是错误的,
foreach my $a (@a) {
foreach my $b (@b) {
print FP "$a $b \n";
}
}
This is wrong. 这是错的。 How do I pass multiple arrays to a
foreach
loop in Perl? 如何将多个数组传递给Perl中的
foreach
循环?
If you want to output all elements of @a
and @b
in parallel, you can loop through all indices of one of them (arrays are of same size so it doesn't matter which), and use it to access actual elements ( $a[$i]
and $b[$i]
) 如果要并行输出
@a
和@b
所有元素,可以循环遍历其中一个元素的所有索引(数组大小相同,因此无关紧要),并使用它来访问实际元素( $a[$i]
和$b[$i]
)
foreach my $i (0 .. $#a) {
print "$a[$i] $b[$i] \n";
}
@a=('1','2','3');
@b=('0.1','0.2','0.3');
print "$a[$_] $b[$_] \n" for (0 .. $#a);
Of course this assumes @a and @b are of equal lengths. 当然这假设@a和@b长度相等。
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