C++ returning boolean as 95
Problem with returning booleans in c++..
bool find( const TrieNode &node, const string word )
{
if (word.length() == 0)
{
if (node.isWord)
{
cout << "TRUE" << endl;
return true;
}
else
{
cout << "FALSE" << endl;
return false;
}
开发者_StackOverflow中文版 }
char firstletter = word.at(0);
int index = firstletter - 'a';
if (node.letters[index] == NULL)
{
return false;
}
else
{
find (*node.letters[index],word.substr(1,(word.length() - 1)));
}
}
in my main I have
cout << find(*mynode,"word") << endl;
would yield to :
FALSE
95
clearly, a cout of FALSE means that the function returns false.. However, when I print out the result of the function, I get 95 which evaluates to true.. Any reason why it could be doing this?
thanks
Your missing a final return statement, so your getting whatever is in the low byte of EAX
, which is random garbage. your probably want return true;
at the very end of your function.
Your should pump the warning level of your compiler as it should be telling you this (something along the lines of "not all control paths return a value").
The problem is with your final if
statement:
if (node.letters[index] == NULL) {
return false;
}
else {
//if execution gets here, the return value of the function is undefined
find (*node.letters[index],word.substr(1,(word.length() - 1)));
}
...perhaps try:
if (node.letters[index] == NULL) {
return false;
}
else {
return find (*node.letters[index],word.substr(1,(word.length() - 1)));
}
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