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Thread: How to print the number of palindrome words in a sentence?

  1. #1
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    Default How to print the number of palindrome words in a sentence?

    public static void main(String args[]){
    Scanner sc= new Scanner(System.in);
    System.out.println("INPUT:\t");
    String str;
    int count=0;
    str=sc.nextLine();
    str=str.replace("."," ");
    str=str.replace("?"," ");
    str=str.replace("!"," ");
    String answer="", ar[]= str.split(" ");
    for(int i=0;i < ar.length;i++){
    if(isPalindrome(ar[i])){
    count++;
    answer += ar[i] + " ";
    }
    }
    System.out.println("OUTPUT:\t\t"+answer+"\nNUMBER OF PALINDROMIC WORDS: "+count);
    }
    public static boolean isPalindrome(String str){
    char ch;
    int len=str.length(),half=len/2;
    for(int i=0;i < half;i++){
    if(str.charAt(i)!=str.charAt(len-i-1)) return false;
    }
    return true;
    }


    If we are not allowed to use split() function, then how should we proceed?

  2. #2
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    Default Re: How to print the number of palindrome words in a sentence?

    You can code your own split() function for this task if the provided one is not allowed. You can split a string into it's words by iterating through the characters, adding them to a temporary string, adding this temporary string to a list when you hit a " " and repeating afterwards. It may look like this:

    import java.util.List;
    import java.util.ArrayList;
     
    ...
     
    public static String[] split(String s) {
    	List<String> output = new ArrayList<String>();
    	String word = "";
    	for (char c : s.toCharArray()) {
    		if (c == ' ') {
                            if(word.length() > 0)
    			output.add(word);
    			word = "";
    		} else
    			word += c;
    	}
    	output.add(word);
    	String[] array = new String[output.size()];
    	array = output.toArray(array);
    	return array;
    }

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