/**

* Exercise on encapsulation and generalization.

*/

public class Exercise {

public static int numberOfParentheses(String input){

int count = 0;

for (int i = 0; i < input.length(); i++) {

char c = input.charAt(i);

count += openAndClose('(',')',c);

}

return count;

}

/*

* This function returns different values when input char is equal to open or close char

*/

public static int openAndClose(char open, char close, char input){

if(input == open){

return 1;

} else if(input == close){

return -1;

} else{

return 0;

}

}

public static void main(String[] args) {

String s = "((3 + 7) * 2)((";

int count = numberOfParentheses(s);

System.out.println(count);

}

}