Question

How to reverse an array of characters without affecting the special characters in Java

Answer 1

public class MyClass {
    static boolean is_letter(char x) { 
        return ((x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z')); 
    } 
    static void reverse(char s[]) { 
        int right = s.length - 1, left = 0; 
       
        while (left < right) { 
            if (!is_letter(s[left])) 
                left++; 
            else if (!is_letter(s[right])) 
                    right--; 
                 else { 
                    char tmp = s[left];
                    s[left] = s[right];
                    s[right] = tmp;
                    left++; 
                    right--; 
                 } 
        } 
    } 
    public static void main(String args[]) {
        String str = "a#b$%c&*(def!";
		char[] s = str.toCharArray();

        reverse(s); 

        System.out.println(s);
    }
}



/*
run:

f#e$%d&*(cba!

*/

 

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Answer 2

public class MyClass {
    static void reverse(char s[]) { 
        int right = s.length - 1, left = 0; 
       
        while (left < right) { 
            if (!Character.isAlphabetic(s[left])) 
                left++; 
            else if (!Character.isAlphabetic(s[right])) 
                    right--; 
                 else { 
                    char tmp = s[left];
                    s[left] = s[right];
                    s[right] = tmp;
                    left++; 
                    right--; 
                 } 
        } 
    } 
    public static void main(String args[]) {
        String str = "a#b$%c&*(def!";
		char[] s = str.toCharArray();

        reverse(s); 

        System.out.println(s);
    }
}



/*
run:

f#e$%d&*(cba!

*/

 

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