java

public class XiW {
public static void main(String []args){
String str = "123456";
//System.out.println(Integer.valueOf(str));
int len = str.length();
char[] data = new char[str.length()];
str.getChars(0,str.length(),data, 0);
int n = 0 ;
for(int i=0;i<str.length();i++){
n = (int) (n+ (data[i]-48)*Math.pow(10, --len));
//System.out.println((data[i]-48)*Math.pow(10, len--));
}
System.out.print(n);
}

}