Converting a String to Lower- or Uppercase - C++ STL

C++ examples for STL:string

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Description

Converting a String to Lower- or Uppercase

Demo Code

#include <iostream>
#include <string>
#include <cctype>
#include <cwctype>
#include <stdexcept>

using namespace std;

void toUpper(basic_string<char>& s) {
   for (basic_string<char>::iterator p = s.begin();p != s.end(); ++p) {
      *p = toupper(*p); // toupper is for char
   }// w  ww  .j a  v  a 2  s  .co  m
}

void toUpper(basic_string<wchar_t>& s) {
   for (basic_string<wchar_t>::iterator p = s.begin();p != s.end(); ++p) {
      *p = towupper(*p); // towupper is for wchar_t
   }
}

void toLower(basic_string<char>& s) {
   for (basic_string<char>::iterator p = s.begin();p != s.end(); ++p) {
      *p = tolower(*p);
   }
}

void toLower(basic_string<wchar_t>& s) {
   for (basic_string<wchar_t>::iterator p = s.begin();p != s.end(); ++p) {
      *p = towlower(*p);
   }
}

int main() {

   string s = "this is a test";
   wstring ws = L"st";

   toUpper(s);
   toUpper(ws);

   cout << "s =  " << s << endl;
   wcout << "ws = " << ws << endl;

   toLower(s);
   toLower(ws);

   cout << "s =  " << s << endl;
   wcout << "ws = " << ws << endl;
}

Result


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