#include <iostream>
S = a new stack of characters
while ( there are still un-processed input characters ){
c = next un-processed character
if ( c is an opening symbol ){
S.push( c )
}
else if ( c is a closing symbol ){
if ( S is empty ){
report error "Too many c"
}
l = S.pop()
if ( l does not match c ){
report error - "Read c, expected r"
// here, r is the closing symbol matching l
}
}
}
if ( S is not empty ){
c = S.pop()
report error "Too many c"
}
report "No Errors Found"
