Function that changes strings to all Capital letters with input?

[AGZZ21]

I need to write a function that takes an input string and changes the string to all capital letters. I have what is on the main, but I don't understand how to do the function.

#include<iostream>
#include<string>
#include<ctype.h>

using namespace std;

string capitalize(string name)
{
	//stuck in this area.
}

int main()
{
	
string name = "John";
capitalize(name);
cout << name << endl;  

return 0;
}

Thanks for the help.

[Hippogriff]

The are lots of ways to do this but the easiest one to understand is properly with for loops and http://www.cplusplus.com/reference/cctype/toupper/.

[giblit]

Basically you want to loop through the string and if it is lower case make it uppercase:

for( int i = 0; name[i]; ++i )
    if( name[i] >= 'a' && name[i] <= 'z' )
        name[i] -= ' ';

http://ideone.com/zFsIy6

You could how ever make it easier to read by using toupper as mentioned earlier ;P