src/utils/mod.rs

@@ -1 +1,2 @@
 mod parse;
+mod poly;

src/utils/poly.rs

@@ -0,0 +1,46 @@
+use std::{fmt::format, str::FromStr, u128, u8};
+
+pub fn get_alpha_rep(num: u128) -> String {
+    let mut powers: Vec<u32> = vec![];
+
+    for shift in 0..127 {
+        //println!("{:?}", ((num >> shift) & 1));
+        if (((num >> shift) & 1) == 1) {
+            println!("Shift success");
+            powers.push(shift);
+        }
+    }
+    //println!("{:?}", powers);
+
+    let mut alpha_rep = String::new();
+
+    if powers.len() == 1 {
+        return String::from_str("1").unwrap();
+    }
+
+    for power in powers {
+        alpha_rep.push_str(&format!("a^{power}"));
+    }
+
+    alpha_rep
+}
+
+#[cfg(test)]
+mod tests {
+    // Note this useful idiom: importing names from outer (for mod tests) scope.
+    use super::*;
+
+    #[test]
+    fn test_num_to_alpha_rep_1() {
+        let number: u128 = 0x010000000000000000000000000000000;
+        let polynomial: &str = "1";
+        assert_eq!(get_alpha_rep(number.reverse_bits()), polynomial);
+    }
+
+    #[test]
+    fn test_num_to_alpha_rep_a4a2a() {
+        let number: u128 = 0x16000000000000000000000000000000;
+        let polynomial: &str = "a^4a^2a";
+        assert_eq!(get_alpha_rep(number.reverse_bits()), polynomial);
+    }
+}