languages/rust
languages/rust
1
0
Fork 0
mirror of https://github.com/rust-lang/rust synced 2024-09-15 22:50:55 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add _int.pow

Browse source
This commit is contained in:
Brian Anderson 2011-03-13 18:29:10 -04:00 committed by Graydon Hoare
parent ac72f42b1c
commit 922f69387d
2 changed files with 28 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
src/lib/_int.rs
View file

@ -34,6 +34,23 @@ fn to_str(mutable int n, uint radix) -> str
}
}
fn pow(int base, uint exponent) -> int {
if (exponent == 0u) {
ret 1;
} else if (base == 0) {
ret 0;
} else {
auto accum = base;
auto count = exponent;
while (count > 1u) {
accum *= base;
count -= 1u;
}
ret accum;
}
}
// Local Variables:
// mode: rust;
// fill-column: 78;

11
src/test/run-pass/lib-int.rs
View file

@ -11,6 +11,17 @@ fn test_to_str() {
check (eq(_int.to_str(100, 10u), "100"));
}
fn test_pow() {
check (_int.pow(0, 0u) == 1);
check (_int.pow(0, 1u) == 0);
check (_int.pow(0, 2u) == 0);
check (_int.pow(-1, 0u) == -1);
check (_int.pow(1, 0u) == 1);
check (_int.pow(-3, 2u) == 9);
check (_int.pow(-3, 3u) == -27);
check (_int.pow(4, 9u) == 262144);
}
fn main() {
test_to_str();
}