Question

How to check if a number is cyclops (number with odd number of digits and zero in the center) in Java

Answer 1

public class MyClass {
    private static boolean isCyclopsNumber(int n) {
    	if (n == 0) {
    		return true;
    	}
    
    	int m = n % 10;
    	int count = 0;
    	while (m != 0) {
    		count++;
    		n /= 10;
    		m = n % 10;
    	}
    
    	n /= 10;
    	m = n % 10;
    	while (m != 0) {
    		count--;
    		n /= 10;
    		m = n % 10;
    	}
    
    	return n == 0 && count == 0;
    }
    public static void main(String args[]) {
      	System.out.println((isCyclopsNumber(209) ? "yes" : "no"));
	    System.out.println((isCyclopsNumber(18037) ? "yes" : "no"));
	    System.out.println((isCyclopsNumber(5604) ? "yes" : "no"));
    }
}






/*
run:
 
yes
yes
no
 
*/

 

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Answer 2

public class MyClass {
    private static boolean OnlyOneZero(String str) {
        int count = 0;
         
        for (char ch : str.toCharArray()) {
            if (ch == '0') {
                count++;
            }
        }
         
        return count == 1;
    }
    
   private static boolean isCyclopsNumber(int n) {
	    if (n == 0) {
		    return true;
	    }

	    String str = Integer.toString(n);
	
	    if ((str.length() % 2) == 0) {
		    return false;
	    }

	    if (!OnlyOneZero(str)) {
		    return false;
	    }

	    int mid_index = str.length() / 2;
	    if (str.charAt(mid_index) == '0') {
		    return true;
	    }

	    return false;
    }

    public static void main(String args[]) {
        System.out.println((isCyclopsNumber(209) ? "yes" : "no"));
        System.out.println((isCyclopsNumber(18037) ? "yes" : "no"));
        System.out.println((isCyclopsNumber(5604) ? "yes" : "no"));
    }
}





/*
run:
  
yes
yes
no
  
*/

 

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