#include <iostream>
#include <string>
using namespace std;
using std::string;



int main()
{
	string str("helloWorld ");
	/*
	the for loop terminates at that very time when the condition is not met. 
	In our case for loop works until the whitespace is met or we go beyond str size
	decltype is the almost the same auto, find data type automatically of the expression!!!
	*/

	for (decltype(str.size()) i = 0; i != str.size() && !isspace(str[i]); i++)
	{
		str[i] = toupper(str[i]);
	}
	

	cout <<"The new string is " << str<< endl;
	return 0;
}