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Rooted by: String to math operation
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  • Strings
    Mathematics
    Code 
    def math(s):
    return eval(s)
     Test Cases 
    test.assert_equals(math("2 + 2"), 4)
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  • Code
    • fn math(e: &str) -> i32 {
    • let mut ope = '\0';
    • let mut first = 0;
    • let mut secon = 0;
    • for c in e.chars() {
    • match c {
    • '+' => {
    • ope = '+';
    • },
    • '-' => {
    • ope = '-';
    • },
    • '*' => {
    • ope = '*';
    • },
    • '/' => {
    • ope = '/';
    • },
    • '=' => {
    • ope = '='
    • }
    • '0'..='9' => {
    • if ope == '\0' {
    • first *= 10;
    • first += c as i32 - '0' as i32;
    • } else {
    • secon *= 10;
    • secon += c as i32 - '0' as i32;
    • }
    • }
    • ' ' => {},
    • _ => {panic!("wrong value");}
    • }
    • }
    • return match ope {
    • '+' => first + secon,
    • '-' => first - secon,
    • '*' => first * secon,
    • '/' => first / secon,
    • '=' => (first == secon) as i32,
    • _ => panic!("no operator")
    • }
    • }
    • def math(s):
    • return eval(s)
     Preloaded Code
    • fn math(e: String) -> i32 {
    • }
     Test Cases
    • #[cfg(test)]
    • mod tests {
    • use super::*;
    • #[test]
    • fn test_add() {
    • assert_eq!(math("1 + 2"), 3);
    • assert_eq!(math("12+ 3456789"), 3456801);
    • assert_eq!(math("50 + 10 0"), 150);
    • }
    • #[test]
    • fn test_sub() {
    • assert_eq!(math("1-3"), -2);
    • assert_eq!(math("500 - 150"), 350);
    • assert_eq!(math("0-2"), -2);
    • }
    • #[test]
    • fn test_multiply() {
    • assert_eq!(math("1* 30"), 30);
    • assert_eq!(math("20 *5"), 100);
    • }
    • #[test]
    • fn test_divide() {
    • assert_eq!(math("10/5"), 2);
    • assert_eq!(math("500 / 2"), 250);
    • }
    • #[test]
    • fn test_equal() {
    • assert_eq!(math("10 = 10"), 1);
    • assert_eq!(math("2 =50"), 0);
    • assert_eq!(math("0=0"), 1);
    • }
    • }
    • test.assert_equals(math("2 + 2"), 4)