STL stack example c++ objc

Here's a simple STL stack example code in c++. It just reverses a string using a STL stack object. [STL stack example]

void reverse(string & x)

//Afterwards x will have the same elements in the opposite order.

{

stack<char> s;

const int n = x.length();

//Put characters from x onto the stack

for(int i=0; i<n; ++i)

s.push(x[i]);

//take characters off of stack and put them back into x

for(int i=0; !s.empty(); ++i, s.pop())

x[i]=s.top();

}