Write a program that uses regular ex- pressions to convert the first letter of all words to uppercase. Have it do this for an arbitrary string input by the user.

Question

What will be an ideal response?

Answer 1

```
#include
#include
#include
#include
using namespace std;

int main()
{
string sentence, output;

// get the sentence from the user
cout << "Please enter a sentence: ";
getline( cin, sentence );

// split the sentence into words
boost::sregex_token_iterator tokens( sentence.begin(), sentence.end(),
boost::regex( "\\s" ), -1 );
boost::sregex_token_iterator end;

// while there are still tokens left
while ( tokens != end )
{
string word = *tokens;
word[0] = toupper( word[0] ); // make the first letter uppercase
output += word + " "; // add the word to the output
++tokens;
} // end while

// display the output string
cout << output << endl;
} // end main
```
Please enter a sentence: this is a sentence with several words
This Is A Sentence With Several Words