c 2b 2b fill string with random uppercase letters

1#include <string>
2
3using namespace std;
4
5string CreateRandomChars(std::size_t ItemCount) {
6    string str; 
7    for(unsigned i=0;i<ItemCount;++i)
8       str.push_back((rand() % 26) + 'A');
9    return str;
10}