cc150-1.2

gistfile1.txt

public class ReverseString_1_2 {
/*1.2 Write code to reverse a C-Style String. (C-String means that “abcd” is represented as five characters, including the null character.)
 * Nothing special  to exchange the  i to  string lenghth -i-1 by useing  stringbuilder
 * O(n) space O(1)
 * */
	public static void main(String[] args ) {
		String test= "879-4uiordedpu;";
		System.out.println(reversString(test));
	}
	
	public static String reversString(String str){
		if(str==null || str.trim().length() == 0)
			return str;
		StringBuilder  result=new StringBuilder(str);
		for(int i =0; i<=str.length()/2;i++){
			char temp = str.charAt(i);
			result.setCharAt(i,  str.charAt(str.length()-1-i));
			result.setCharAt(str.length()-1-i, temp);
		} 
		
		return result.toString();
		
	}
}