added a rudimentary fraction representation helper

src/context/helper.rs

@@ -1,3 +1,4 @@
+
 use evalexpr::{
 	Value,
 
@@ -38,6 +39,25 @@ pub fn fix(arg: &Value) -> EvalResult {
 	} else { Err(EvalexprError::wrong_function_argument_amount(1, 2)) }
 }
 
+pub fn fraction(arg: &Value) -> EvalResult {
+	if let Value::Float(arg) = arg {
+		let mut intermediate = arg.clone();
+		let mut pow = 0;
+		while intermediate.fract() != 0_f64 {
+			intermediate *= 10_f64;
+			pow += 1;
+		}
+		let value = intermediate as i64;
+		let tens: i64 = 10_i64.pow(pow);
+		let gcd = util::gcd(value, tens);
+
+		let numerator = value / gcd;
+		let denominator = tens / gcd;
+
+		Ok(Value::String(format!("{numerator}/{denominator}")))
+	} else { Err(EvalexprError::expected_float(arg.clone())) }
+}
+
 pub fn greatest_common_divisor(arg: &Value) -> EvalResult {
 	if let Value::Tuple(args) = arg {
 		let len = args.len();

src/context/mod.rs

@@ -27,6 +27,7 @@ pub fn build(args: &mut Arguments) -> HashMapContext {
 
 				//	math functions
 				"cos"	=>	Function::new(|arg| helper::cosine(arg)),
+				"fract"	=>	Function::new(|arg| helper::fraction(arg)),
 				"fix"	=>	Function::new(|arg| helper::fix(arg)),
 				"gcd"	=>	Function::new(|arg| helper::greatest_common_divisor(arg)),
 				"lcm"	=>	Function::new(|arg| helper::least_common_multiple(arg)),

src/main.rs

@@ -14,7 +14,6 @@ use std::{
 use evalexpr::{
 	eval_with_context_mut,
 
-	ContextWithMutableVariables,
 	EvalexprError,
 	HashMapContext,
 	Value