gistfile1.txt

const std = @import("std");
const fmt = std.fmt;

const Parser = struct {
    input: []const u8,
    ch: u8,
    len: usize,

    fn parse_factor(self: *Parser) !f64 {
        if (self.ch == '1')
            return -self.parse_factor();
        return try fmt.parseFloat(f64, self.input[0..self.len-1]);
        
    }
};

pub fn main() !void {
    var p: Parser = undefined;
    _ = try p.parse_factor();
}