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pub fn solve_string(mut input: String) -> f32 {
let mut answer: f32 = 404.0;
let mut operator_places = vec![];
let exponent = "^";
let multiplication = "*";
let division = "/";
let addition = "+";
let subtraction = "~";
let mut current_letter;
let mut before_letter= "l";
let mut num_of_parth = 0;
let mut most_inner_parth;
let mut places_after_most_inner;
let mut runner;
let mut before_input = input.clone();
input = "".to_string();
input.push_str("(");
input.push_str(&before_input);
input.push_str(")");
for i in 0..input.len() {
current_letter = &input[i..i + 1];
if current_letter == "(" {
num_of_parth = num_of_parth + 1
}
}
for i in 1..input.len() {
current_letter = &input[i..i + 1];
before_input = input.clone();
before_letter = &before_input[i - 1..i];
if (current_letter == "-") & (is_string_numeric(std::string::String::from(before_letter)) == true) {
input = "".to_string();
input.push_str(&((&before_input[0..i] as &str).to_owned() + "~" + &(before_input[i + 1..])));
}
}
while num_of_parth > 0 {
most_inner_parth = 0;
places_after_most_inner = 0;
runner = 0;
for i in 0..input.len() {
current_letter = &input[i..i + 1];
if current_letter == "(" {
most_inner_parth = most_inner_parth + runner;
runner = 0;
} else if current_letter == ")" {
break;
}
runner = runner + 1;
}
for i in most_inner_parth..input.len() {
current_letter = &input[i..i + 1];
if current_letter == ")" {
break;
} else {
places_after_most_inner = places_after_most_inner + 1;
}
}
let mut new_input = (&input[(most_inner_parth + 1) as usize..(most_inner_parth + places_after_most_inner) as usize]).to_string();
for i in 0..new_input.len() {
current_letter = &new_input[i..i + 1];
if current_letter == exponent {
operator_places.push(exponent);
}
}
for i in 0..new_input.len() {
current_letter = &new_input[i..i + 1];
if current_letter == multiplication {
operator_places.push(multiplication);
} else if current_letter == division {
operator_places.push(division);
}
}
for i in 0..new_input.len() {
current_letter = &new_input[i..i + 1];
if current_letter == addition {
operator_places.push(addition);
} else if current_letter == subtraction {
operator_places.push(subtraction);
}
}
for i in 0..operator_places.len() {
let mut beforeplaces = 1;
let mut afterplaces = 1;
let current_operator = operator_places[i];
let mut int_cop: i32 = 0;
for s in 0..new_input.len() {
current_letter = &new_input[s..s + 1];
if current_operator == current_letter {
int_cop = s as i32;
}
}
let mut ch_p: usize;
loop {
ch_p = (int_cop - beforeplaces) as usize;
if ch_p == 0 {
break;
}
let ch = (&new_input[ch_p - 1..ch_p]).to_string();
if true == is_string_numeric(ch.clone()) || (ch == ".") || (ch == "-") {
beforeplaces = beforeplaces + 1;
} else {
break;
}
}
loop {
ch_p = (int_cop + afterplaces + 1) as usize;
if ch_p == new_input.len() {
break;
}
let ch = (&new_input[ch_p..ch_p + 1]).to_string();
if true == is_string_numeric(ch.clone()) || (ch == ".") || (ch == "-") {
afterplaces = afterplaces + 1;
} else {
break;
}
}
let firstnumf32 = (&new_input[(int_cop - beforeplaces) as usize..(int_cop) as usize]).parse::<f32>().unwrap();
let secnumf32 = (&new_input[(int_cop + 1) as usize..(int_cop + afterplaces + 1) as usize]).parse::<f32>().unwrap();
if current_operator == exponent {
answer = firstnumf32.powf(secnumf32);
}
if current_operator == multiplication {
answer = firstnumf32 * secnumf32;
}
if current_operator == division {
answer = firstnumf32 / secnumf32;
}
if current_operator == addition {
answer = firstnumf32 + secnumf32;
}
if current_operator == subtraction {
answer = firstnumf32 - secnumf32;
}
let inputcash1 = &new_input.clone()[0 as usize..int_cop as usize - beforeplaces as usize];
let inputcash2 = &answer.to_string() as &str;
let inputcash3 = &new_input.clone()[(int_cop + afterplaces + 1) as usize..new_input.len() as usize];
new_input = ("").parse().unwrap();
new_input.push_str(inputcash1);
new_input.push_str(inputcash2);
new_input.push_str(inputcash3);
}
let inputclone = input.clone();
let inputcash1 = &inputclone[0 as usize..most_inner_parth as usize];
let inputcash2 = &answer.to_string() as &str;
let inputcash3 = &inputclone[(most_inner_parth + places_after_most_inner + 1) as usize..(input.len()) as usize];
input = ("").parse().unwrap();
input.push_str(inputcash1);
input.push_str(inputcash2);
input.push_str(inputcash3);
num_of_parth = num_of_parth - 1;
operator_places.clear();
}
println!("{}", answer);
return answer;
}
fn is_string_numeric(str: String) -> bool {
for c in str.chars() {
if !c.is_numeric() {
return false;
}
}
return true;
}