CODEWITHSUNDEEP
typesrustreturnbooleanpalindrome
Aman Verma
Aman Verma

Reputation: 123

error[E0308]: mismatched types expected `()`, found `bool`. How to remove this error?

program to check palindrome

pub fn is_palindrome(str: &str, start: i32, end: i32) -> bool

{

    //if empty string
    if str.is_empty() {
        true
    }

    // If there is only one character
    if start == end {
        true
    }

    // If first and last
    // characters do not match
    if str.chars().nth(start as usize) != str.chars().nth(end as usize) {
        false
    }

    // If there are more than
    // two characters, check if
    // middle substring is also
    // palindrome or not.
    if start < end + 1 {
        is_palindrome(str, start + 1, end - 1)
    }
    true
}

This is my code I get error in return statements. It says error[E0308]: mismatched types expected (), found bool Please tell how to solve this.

Upvotes: 0

Views: 1613

Answers (1)

Rabbid76
Rabbid76

Reputation: 210909

You forget the return statements which has to be used if you want to return a value earlier from within a function (See also Functions):

pub fn is_palindrome(str: &str, start: i32, end: i32) -> bool {

    //if empty string
    if str.is_empty() {
        return true;
    }

    // If there is only one character
    if start == end {
        return true;
    }

    // If first and last
    // characters do not match
    if str.chars().nth(start as usize) != str.chars().nth(end as usize) {
        return false;
    }

    // If there are more than
    // two characters, check if
    // middle substring is also
    // palindrome or not.
    if start < end + 1 {
        return is_palindrome(str, start + 1, end - 1);
    }
    true
}

Upvotes: 2

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