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bigint: Added some more helpers.

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This commit is contained in:
Jeroen van Rijn
2021-08-11 20:59:50 +02:00
parent cccd290834
commit baef0c291d
4 changed files with 296 additions and 33 deletions
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core/math/bigint/example.odin
+42 -32
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@@ -41,48 +41,58 @@ _SQR_TOOM_CUTOFF,
fmt.println();
}
print :: proc(name: string, a: ^Int, base := i8(16)) {
as, err := itoa(a, base);
defer delete(as);
if err == .OK {
fmt.printf("%v (base: %v, bits used: %v): %v\n", name, base, count_bits(a), as);
} else {
fmt.printf("%v (error: %v): %v\n", name, err, a);
}
}
demo :: proc() {
a, b, c: ^Int;
as, bs, cs: string;
err: Error;
a, b, c: ^Int;
err: Error;
a, err = init();
a.digit[2] = 512;
a.used = 3;
defer destroy(a);
as, err = itoa(a, 16);
fmt.printf("a: %v, err: %v\n\n", as, err);
delete(as);
b, err = init(42);
defer destroy(b);
bs, err = itoa(b, 16);
fmt.printf("b: %s, err: %v\n\n", bs, err);
delete(bs);
defer destroy(c);
a, err = init(1+4+16+64);
b, err = init(1+2+8+32+128);
c, err = init(-4);
defer destroy(c);
cs, err = itoa(c, 16);
fmt.printf("c: %s, err: %v\n\n", cs, err);
delete(cs);
// cstr: cstring;
// defer delete(cstr);
print("a", a, 2);
print("b", b, 2);
print("c", c, 2);
// cstr, err = itoa_cstring(a);
// fmt.printf("cstring: %v, err: %v\n\n", cstr, err);
fmt.println("=== a = a & b ===");
err = and(a, a, b);
fmt.printf("a &= b error: %v\n", err);
fmt.println("=== Add ===");
err = sub(c, a, b);
print("a", a, 2);
print("b", b, 10);
fmt.printf("Error: %v\n", err);
as, err = itoa(a, 16);
bs, err = itoa(b, 16);
cs, err = itoa(c, 16);
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("\n\n=== b = abs(c) ===");
c.sign = .Negative;
abs(b, c); // copy c to b.
print("b", b);
print("c", c);
fmt.println("\n\n=== Set a to (1 << 120) - 1 ===");
if err = power_of_two(a, 120); err != .OK {
fmt.printf("Error %v while setting a to 1 << 120.\n", err);
}
if err = sub(a, a, 1); err != .OK {
fmt.printf("Error %v while subtracting 1 from a\n", err);
}
print("a", a, 16);
fmt.println("Expected a to be: FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
}
main :: proc() {