cppreference.com > C++ Algorithms > max max Syntax:
      #include <algorithm>
      const TYPE& max( const TYPE& x, const TYPE& y );
      const TYPE& max( const TYPE& x, const TYPE& y, BinPred p );
The max() function returns the greater of x and y. If the binary predicate p is given, then it will be used instead of the < operator to compare the two elements. Example code: For example, the following code snippet displays various uses of the max() function:
     cout << "Max of 1 and 9999 is " << max( 1, 9999) << endl;
     cout << "Max of 'a' and 'b' is " << max( 'a', 'b') << endl;
     cout << "Max of 3.14159 and 2.71828 is " << max( 3.14159, 2.71828) << endl;
When run, this code displays:
     Max of 1 and 9999 is 9999
     Max of 'a' and 'b' is b
     Max of 3.14159 and 2.71828 is 3.14159
Related topics: max_element min min_element