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


string firstWord(string str);

int main()
{	
	string str;
	cout << "Enter the string: " << endl;
	getline(cin, str);
	
	
	cout << firstWord(str) << endl;

	return 0;
}

string firstWord(string str)
{
	string result = "";

	for (int i = 0; !isspace(str[i]) && str.size(); i++)
	{
		result += str[i];
	}
	return result;
}
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