(C++) std::toupper

std::toupper is a function defined in the header file cctype.h to convert a char to upper case.

Example: StrToUpper using a for loop

StrToUpper can be implemented using a for loop, but prefer algorithm calls over hand-written loops [1][2]. View Exercise #9: No for-loops for other ways of replacing for-loops by algorithms.


#include <cctype>

#include <string>



//From http://www.richelbilderbeek.nl/CppStrToUpper.htm

const std::string StrToUpper(std::string s) //Not the preferred way

{

  const int sz = static_cast<int>(s.size());

  for(int i=0; i!=sz; ++i)

  {

    s[i] = std::toupper(s[i]);

  }

  return s;

}

References

Bjarne Stroustrup. The C++ Programming Language (3rd edition). 1997. ISBN: 0-201-88954-4. Chapter 18.12.1: 'Prefer algorithms to loops.
Scott Meyers. Effective STL. ISBN: 0-201-74962-9. Item 43: 'Prefer algorithm calls over hand-written loops'.

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