40 lines
1.2 KiB
Zig
40 lines
1.2 KiB
Zig
const expect = @import("std").testing.expect;
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// Zig's floats are strictly IEEE-compliant unless `@setFloatMode(.Optimized)` is used,
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// which is equivalent to GCC's `-ffast-math`.
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// Floats coerce to larger float types.
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test "float widening" {
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const a: f16 = 0;
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const b: f32 = a;
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const c: f128 = b;
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try expect(c == @as(f128, a));
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}
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// Floats support multiple kinds of literal.
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const floating_point: f64 = 123.0E+77;
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const another_float: f64 = 123.0;
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const yet_another: f64 = 123.0e+77;
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const hex_floating_point: f64 = 0x103.70p-5;
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const another_hex_float: f64 = 0x103.70;
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const yet_another_hex_float: f64 = 0x103.70P-5;
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// Underscores may also be placed between digits.
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const lightspeed: f64 = 299_792_458.000_000;
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const nanosecond: f64 = 0.000_000_001;
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const more_hex: f64 = 0x1234_5678.9ABC_CDEFp-10;
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// Integers and floats may be converted using the built-in functions `@floatFromInt` and `@intFromFloat`.
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// `@floatFromInt` is always safe, whereas `@intFromFloat` is detectable illegal behaviour
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// if the float value cannot fit in the integer destination type.
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test "int-float conversion" {
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const a: i32 = 0;
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const b = @as(f32, @floatFromInt(a));
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const c = @as(i32, @intFromFloat(b));
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try expect(c == a);
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}
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