perl - 为什么 printf 和 sprintf 在仅给定数组时表现不同？

Question

sub do_printf  { printf @_ }
sub do_sprintf { print sprintf @_ }

do_printf("%s\n", "ok");  # prints ok
do_sprintf("%s\n", "ok"); # prints 2

Answer 1

来自 perldoc on sprintf :

Unlike printf, sprintf does not do what you probably mean when you pass it an array as your first argument. The array is given scalar context, and instead of using the 0th element of the array as the format, Perl will use the count of elements in the array as the format, which is almost never useful.