zig/test/cases/math.zig

fn exactDivision() {
    @setFnTest(this);

    assert(divExact(55, 11) == 5);
}
fn divExact(a: u32, b: u32) -> u32 {
    @divExact(a, b)
}

fn floatDivision() {
    @setFnTest(this);

    assert(fdiv32(12.0, 3.0) == 4.0);
}
fn fdiv32(a: f32, b: f32) -> f32 {
    a / b
}

fn overflowIntrinsics() {
    @setFnTest(this);

    var result: u8 = undefined;
    assert(@addWithOverflow(u8, 250, 100, &result));
    assert(!@addWithOverflow(u8, 100, 150, &result));
    assert(result == 250);
}

fn shlWithOverflow() {
    @setFnTest(this);

    var result: u16 = undefined;
    assert(@shlWithOverflow(u16, 0b0010111111111111, 3, &result));
    assert(!@shlWithOverflow(u16, 0b0010111111111111, 2, &result));
    assert(result == 0b1011111111111100);
}

fn countLeadingZeroes() {
    @setFnTest(this);

    assert(@clz(u8(0b00001010)) == 4);
    assert(@clz(u8(0b10001010)) == 0);
    assert(@clz(u8(0b00000000)) == 8);
}

fn countTrailingZeroes() {
    @setFnTest(this);

    assert(@ctz(u8(0b10100000)) == 5);
    assert(@ctz(u8(0b10001010)) == 1);
    assert(@ctz(u8(0b00000000)) == 8);
}

fn modifyOperators() {
    @setFnTest(this);

    var i : i32 = 0;
    i += 5;  assert(i == 5);
    i -= 2;  assert(i == 3);
    i *= 20; assert(i == 60);
    i /= 3;  assert(i == 20);
    i %= 11; assert(i == 9);
    i <<= 1; assert(i == 18);
    i >>= 2; assert(i == 4);
    i = 6;
    i &= 5;  assert(i == 4);
    i ^= 6;  assert(i == 2);
    i = 6;
    i |= 3;  assert(i == 7);
}

fn threeExprInARow() {
    @setFnTest(this);

    assertFalse(false || false || false);
    assertFalse(true && true && false);
    assertFalse(1 | 2 | 4 != 7);
    assertFalse(3 ^ 6 ^ 8 != 13);
    assertFalse(7 & 14 & 28 != 4);
    assertFalse(9  << 1 << 2 != 9  << 3);
    assertFalse(90 >> 1 >> 2 != 90 >> 3);
    assertFalse(100 - 1 + 1000 != 1099);
    assertFalse(5 * 4 / 2 % 3 != 1);
    assertFalse(i32(i32(5)) != 5);
    assertFalse(!!false);
    assertFalse(i32(7) != --(i32(7)));
}
fn assertFalse(b: bool) {
    assert(!b);
}


fn constNumberLiteral() {
    @setFnTest(this);

    const one = 1;
    const eleven = ten + one;

    assert(eleven == 11);
}
const ten = 10;



// TODO const assert = @import("std").debug.assert;
fn assert(ok: bool) {
    if (!ok)
        @unreachable();
}