Code not working

#1

int main() {

stack<char> s;

string str;
cin >> str;

for(int i=0;i<str.length();i++) {
	char ch = str[i];
	if(ch == '(') {
		s.push(ch);
	} else if(ch == ')'){
		if(s.top() == '(') {
			s.pop();
		} else {
			cout << "Not Balanced";
			return 0;
		}
	}
}
if(s.size() == 0) cout << "Balanced";
else cout << "Not Balanced";
return 0;

}

This is should give Not Balanced for string ()) .
It is crashing unexpectedly.Why?

#2

Before performing s.pop() or s.top() you must ensure that the stack is empty.
Try to correct that.
You can save your code on ide.codingblocks.com and then share its link.

#3

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