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pub mod addition;
pub mod difference;
pub mod largeint {
use difference::*;
use addition::*;
#[derive(PartialEq, Debug)]
pub struct LargeInt {
pub digits: String,
pub sign: Sign,
}
#[derive(PartialEq, Debug)]
pub enum Sign {
Positive,
Negative,
Unsigned,
}
#[derive(PartialEq, Debug)]
pub enum Compare {
Larger,
Equal,
Smaller,
}
impl LargeInt {
pub fn get_int(&self) -> String {
let mut int = String::new();
int.push_str(&self.digits);
int
}
pub fn get_sign(&self) -> String {
let sign: String;
if &self.sign == &Sign::Positive {
sign = String::from("Positive");
} else if &self.sign == &Sign::Negative {
sign = String::from("Negative");
} else {
sign = String::from("Unsigned");
}
sign
}
pub fn compare(&self, large2: &LargeInt) -> Compare {
let mut flag = Compare::Larger;
let large1 = to_vec(&self.digits);
let large2 = to_vec(&large2.digits);
if large1.len() < large2.len() {
flag = Compare::Smaller;
} else if large1 == large2 {
flag = Compare::Equal;
} else if large1.len() == large2.len() {
for i in 0..large2.len() {
if &large2[i] > &large1[i] {
flag = Compare::Smaller;
break
}
else if &large2[i] < &large1[i] {
break
}
else {
continue
}
}
}
flag
}
pub fn add(&self, large2: &LargeInt) -> LargeInt {
let digits: String;
let sign: Sign;
if &self.sign == &Sign::Positive && large2.sign == Sign::Positive {
digits = addition(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.sign == &Sign::Positive && large2.sign == Sign::Negative {
if &self.digits.len() > &large2.digits.len() {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.digits.len() < &large2.digits.len(){
digits = difference(&large2.digits, &self.digits);
sign = Sign::Negative;
} else if &self.compare(&large2) == &Compare::Larger {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.compare(&large2) == &Compare::Smaller {
digits = difference(&large2.digits, &self.digits);
sign = Sign::Negative;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
} else if &self.sign == &Sign::Negative && large2.sign == Sign::Positive {
if &self.digits.len() > &large2.digits.len() {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Negative;
} else if &self.digits.len() < &large2.digits.len(){
digits = difference(&large2.digits, &self.digits);
sign = Sign::Positive;
} else if &self.compare(&large2) == &Compare::Larger {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Negative;
} else if &self.compare(&large2) == &Compare::Smaller {
digits = difference(&large2.digits, &self.digits);
sign = Sign::Positive;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
} else if &self.sign == &Sign::Unsigned || large2.sign == Sign::Unsigned {
match &self.sign {
&Sign::Unsigned => {
if large2.sign == Sign::Positive {
digits = large2.get_int();
sign = Sign::Positive;
} else if large2.sign == Sign::Negative {
digits = large2.get_int();
sign = Sign::Negative;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
}
&Sign::Positive => {
digits = self.get_int();
sign = Sign::Positive;
}
&Sign::Negative => {
digits = self.get_int();
sign = Sign::Negative;
}
}
} else {
digits = addition(&self.digits, &large2.digits);
sign = Sign::Negative;
}
LargeInt {
digits,
sign,
}
}
pub fn subtract(&self, large2: &LargeInt) -> LargeInt{
let digits: String;
let sign: Sign;
if &self.sign == &Sign::Positive && large2.sign == Sign::Positive {
if &self.digits.len() > &large2.digits.len() {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.digits.len() < &large2.digits.len(){
digits = difference(&large2.digits, &self.digits);
sign = Sign::Negative;
} else if &self.compare(&large2) == &Compare::Larger {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.compare(&large2) == &Compare::Smaller {
digits = difference(&large2.digits, &self.digits);
sign = Sign::Negative;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
} else if &self.sign == &Sign::Positive && large2.sign == Sign::Negative {
digits = addition(&self.digits, &large2.digits);
sign = Sign::Positive;
} else if &self.sign == &Sign::Negative && large2.sign == Sign::Positive {
digits = addition(&self.digits, &large2.digits);
sign = Sign::Negative;
} else if &self.sign == &Sign::Negative && large2.sign == Sign::Negative {
if &self.digits.len() > &large2.digits.len() {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Negative;
} else if &self.digits.len() < &large2.digits.len() {
digits = difference(&large2.digits, &self.digits);
sign = Sign::Positive;
} else if &self.compare(&large2) == &Compare::Larger {
digits = difference(&self.digits, &large2.digits);
sign = Sign::Negative;
} else if &self.compare(&large2) == &Compare::Smaller {
digits = difference(&large2.digits, &self.digits);
sign = Sign::Positive;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
} else {
match &self.sign {
&Sign::Unsigned => {
if large2.sign == Sign::Positive {
digits = large2.get_int();
sign = Sign::Negative;
} else if large2.sign == Sign::Negative {
digits = large2.get_int();
sign = Sign::Positive;
} else {
digits = String::from("0");
sign = Sign::Unsigned;
}
}
&Sign::Positive => {
digits = self.get_int();
sign = Sign::Positive;
}
&Sign::Negative => {
digits = self.get_int();
sign = Sign::Negative;
}
}
}
LargeInt {
digits,
sign,
}
}
}
pub fn new(digits: String, mut sign: Sign) -> LargeInt {
let mut digits_clone = digits.clone();
let digit_0 = &digits[0..1];
if digits == String::from("") {
panic!("The large integer value is undefined!")
} else if digit_0 == "0" && digits.len() > 1 {
panic!("Invalid LargeInt creation. Please remove the leading 0")
} else if digit_0 == "0" && digits.len() == 1 {
digits_clone = String::from("0");
sign = Sign::Unsigned;
} else if digit_0 != "0" && sign == Sign::Unsigned {
panic!("Invalid LargeInt creation. Nonzero integers must be assigned
either Sign::Positive or Sign::Negative")
}
let new_int = LargeInt {
digits: digits_clone,
sign: sign,
};
new_int
}
pub fn to_vec(input_str: &str) -> Vec<u8> {
let mut vec: Vec<u8> = Vec::new();
for i in input_str.chars() {
let vec_input = i.to_digit(10).unwrap() as u8;
vec.push(vec_input);
}
vec
}
pub fn vec_to_str(vec: &Vec<u8>) -> String {
let mut output = String::from("");
for i in vec {
output.push_str(&i.to_string());
}
output
}
}