Programming 4 - 400 points
Description: interpret and give answer. start reading from left if digit then add the digit. if x then remove it and go back 2 places if y then remove and go front 2 places
example : 12y34x56 answer is 14
how : 1 + 2 + 5 + 6 = 14
12y34x5612345678910xy0981235432x4765893x219532y875439664y3x 2345688x754312x2456x7876554x43y324x6778y7643223457789494x98696763y15348798y765341y1878979
public class FunkyText {
/** * @param args the command line arguments */
public static void main(String[] args) {
// TODO code application logic here
String num="12y34x5612345678910xy0981235432x4765893x219532y875439664y3x2345688x754312x2456x7876554x43y324x6778y7643223457789494x98696763y15348798y765341y1878979";
int total=0;
int num_length=num.length();
for(int index=0;index<num_length;index++)
{
System.out.println("index:"+index);
switch(num.charAt(index))
{
case 'x':
{
num=num.substring(0, index)+num.substring(index+1,num.length());
num_length=num.length();
index=index-2;
break;
}
case 'y':
{
num=num.substring(0, index)+num.substring(index+1,num.length());
num_length=num.length();
index=index+2;
break;
}
default:
{
total=total+(Integer.parseInt(num.substring(index, index+1)));
}
}
System.out.println("The string:"+num);
System.out.println("Total:"+total);
}
}
By using the example of : 12y34x56 answer is 14 how : 1 + 2 + 5 + 6 = 14. We are able to observe and create a logic by manipulating the character position of the statement itself such in this way that I have decided to use the String data type to manipulate the logic to produce the FLAG.
Character position/number: 0 1 2 3 4 5 6 7 Character: 1 2 y 3 4 x 5 6
Based on figure above, when the switch-case encounters a non-x or y character the program will execute the default statement of
"total=total+(Integer.parseInt(num.substring(index, index+1)));"
where by converting the character within the string at the character position into an integer data type and add the following digit into the total variable. Meanwhile, if the switch-case either meets an x character the following statement occurs:
num=num.substring(0, index)+num.substring(index+1,num.length()); num_length=num.length(); index=index-2;
Translation, the program will create a new string that will override the previous string with the deletion of the "x" character at that particular character position and at the same time moves back 2 spaces in the character position index. Same situation occurs in "y" except the character position is moved 2 spaces front. Thus once the program has reached the end, the FLAG sum is printed.
The flag is: 557