数据结构与程序设计练习2.2E2（b)

Error_code copy_stack(Stack & dest , Stack & source)
{

Error_code detected = success ;

Stack temp ;

Stack_entry item ;

while (detected == success && ! source.empty()) {

detected = source.top( item ) ;

detected = source.pop() ;

if (detected == success ) detected = temp.push(item) ;

}

while(detected == success && ! temp.empty()) {

detected = temp.top(item) ;

detected = temp.pop() ;

if (detected == success) detected = source.push(item) ;

if(detected == success) detected = dest.push(item) ;

}

return detected;

}