Function modf [src]

Alias for std.math.modf.modf

Returns the integer and fractional floating-point numbers that sum to x. The sign of each result is the same as the sign of x. In comptime, may be used with comptime_float Special Cases: modf(+-inf) = +-inf, nan modf(nan) = nan, nan

Prototype

pub fn modf(x: anytype) Modf(@TypeOf(x))

Example

 test modf {
    inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
        const epsilon: comptime_float = @max(1e-6, math.floatEps(T));

        var r: Modf(T) = undefined;

        r = modf(@as(T, 1.0));
        try expectEqual(1.0, r.ipart);
        try expectEqual(0.0, r.fpart);

        r = modf(@as(T, 0.34682));
        try expectEqual(0.0, r.ipart);
        try expectApproxEqAbs(@as(T, 0.34682), r.fpart, epsilon);

        r = modf(@as(T, 2.54576));
        try expectEqual(2.0, r.ipart);
        try expectApproxEqAbs(0.54576, r.fpart, epsilon);

        r = modf(@as(T, 3.9782));
        try expectEqual(3.0, r.ipart);
        try expectApproxEqAbs(0.9782, r.fpart, epsilon);
    }
}

Source

  pub fn modf(x: anytype) Modf(@TypeOf(x)) {
    const ipart = @trunc(x);
    return .{
        .ipart = ipart,
        .fpart = x - ipart,
    };
}  