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  1. #include <string>
  2. #include <cctype>
  3. #include <iostream>
  4. #include <algorithm>
  5.  
  6. int main()
  7. {
  8.     std::string str = "loop through a string and uppercase each letter\n" ;
  9.  
  10.     for( char& c : str ) c = std::toupper(c) ; // 1
  11.     std::cout << str ;
  12.  
  13.     for( std::string::iterator iter = str.begin() ; iter != str.end() ; ++iter ) // 2
  14.           *iter = std::tolower( *iter ) ;
  15.     std::cout << str ;
  16.  
  17.     for( std::string::size_type i = 0 ; i < str.size() ; ++i ) // 3
  18.           str[i] = std::toupper(str[i]) ;
  19.     std::cout << str ;
  20.  
  21.     std::transform( str.begin(), str.end(), str.begin(), ( int(*)(int) )std::tolower ) ; // 4
  22.     std::cout << str ;
  23. }
  24.  
Success #stdin #stdout 0s 2984KB
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stdin
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Standard input is empty
stdout
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LOOP THROUGH A STRING AND UPPERCASE EACH LETTER
loop through a string and uppercase each letter
LOOP THROUGH A STRING AND UPPERCASE EACH LETTER
loop through a string and uppercase each letter
https://ideone.com/b47lJF
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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