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bigint: Working on itoa and logn.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:50 +02:00
parent 905d5459a9
commit dbcd8da733
6 changed files with 172 additions and 28 deletions
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core/math/bigint/example.odin
+21 -22
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@@ -41,43 +41,42 @@ _SQR_TOOM_CUTOFF,
fmt.println();
}
print_int :: proc(a: ^Int, print_raw := false) -> string {
if print_raw {
return fmt.tprintf("%v", a);
}
sign := "-" if a.sign == .Negative else "";
if a.used <= 2 {
v := _WORD(a.digit[1]) << _DIGIT_BITS + _WORD(a.digit[0]);
return fmt.tprintf("%v%v", sign, v);
} else {
return fmt.tprintf("[%2d/%2d] %v%v", a.used, a.allocated, sign, a.digit[:a.used]);
}
}
demo :: proc() {
a, b, c: ^Int;
a, b, c: ^Int;
as, bs, cs: string;
err: Error;
a, err = init(512);
defer destroy(a);
fmt.printf("a: %v, err: %v\n\n", print_int(a), err);
as, err = itoa(a, 10);
fmt.printf("a: %v, err: %v\n\n", as, err);
delete(as);
b, err = init(42);
defer destroy(b);
fmt.printf("b: %v, err: %v\n\n", print_int(b), err);
bs, err = itoa(b, 10);
fmt.printf("b: %v, err: %v\n\n", bs, err);
delete(bs);
c, err = init();
defer destroy(c);
fmt.printf("c: %v\n", print_int(c, true));
cs, err = itoa(c, 10);
fmt.printf("c: %v\n", cs);
delete(cs);
fmt.println("=== Add ===");
err = sub(c, a, b);
// err = add(c, a, b);
fmt.printf("Error: %v\n", err);
fmt.printf("a: %v, bits: %v\n", print_int(a), count_bits(a));
fmt.printf("b: %v, bits: %v\n", print_int(b), count_bits(b));
fmt.printf("c: %v, bits: %v\n", print_int(c), count_bits(c));
as, err = itoa(a, 10);
bs, err = itoa(b, 10);
cs, err = itoa(c, 10);
fmt.printf("a: %v, bits: %v\n", as, count_bits(a));
fmt.printf("b: %v, bits: %v\n", bs, count_bits(b));
fmt.printf("c: %v, bits: %v\n", cs, count_bits(c));
delete(as); delete(bs); delete(cs);
fmt.println("log2:", log_n(a, 8));
}
main :: proc() {