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```{index} single: gmp_tstbit; Math::GMP function
```
```{index} single: Math::GMP::gmp_tstbit; Perl function
```

# gmp_tstbit

Return bit `$n` of `$x` (0-indexed, from the least significant end).

## Synopsis

```perl
my $x = Math::GMP->new(0b1010);
print $x->gmp_tstbit(1);       # 1
print $x->gmp_tstbit(2);       # 0
```

For negative values, `libgmp` uses a two's-complement view. Bits
above the most significant set bit of a positive value read as `0`.