Max value of a vector

Question

I have a vector of doubles and I need to get the maximum value within it and then store the value inside an integer variable so that I can compare the value. I have this so far:

 vector<double>::iterator result;

result = max_element(zerocrossdata.begin(), zerocrossdata.end());

Anyone know how I can place the value inside a variable? Confused!!

Answer 1

The std::max_element() function returns an iterator pointing to the maximum element in the vector.

So to get the actual maximum value you just need to dereference the returned iterator like so:

double max_value = *result;

Answer 2

You need to deference the iterator using the * operator, as has already been stated by others:

int max_value = *result;

However, be aware that the result of this operation will be a double , not an int. On almost all platforms, double will be an 8 byte floating point value. Your result could be outside the range of values an int (typically a signed 4-byte integer) can support. This could result in unexpected behaviour, and you may (or may not) get a compiler warning about it, depending on your compiler and settings.