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[code101]

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[jsmith]

This doesn't make sense:

if ((!error) && isEmpty(s))
    cout<<"\nResult: This expression is not balanced. \n"<<endl;
else
    cout <<"\nResult: This expression is balanced. \n"<<endl;

The expression is not balanced if error is true (too many closing parens)
OR if the stack is NOT empty (too few closing parens).

[code101]

thanks for the reply works now