help with cin << string

int main() {

	double measurement=0;
	string unit_of_measurement = " ";
	//conversion factors
	double meterToCentimeter = 100;
	double inchToCentimeter = 2.54;
	double footToInches = 12;
	double centimeters=0.0;

	//define two variables to keep track of which is smallest and largest so far
	double smallestSoFar=0.0, largestSoFar=0.0;

	cout<<"Enter a float and then hit enter.\n";
	vector<double> Values;
	unsigned int size_of_values = 0;

	while (cin >> measurement >> unit_of_measurement) {   // *** Crashes here when ft or in ***
		//convert measurement to centimeters
		if (unit_of_measurement == "m")  centimeters = measurement*meterToCentimeter;
		if (unit_of_measurement == "in") centimeters = measurement*inchToCentimeter;
		if (unit_of_measurement == "ft") centimeters = (measurement*footToInches)*inchToCentimeter;

		//Add measurement to the vector
		Values.push_back(measurement);
		//Assign the size of the vector to size_of_values
		size_of_values = Values.size();
		//Using ranged based for loop
		for (double i : Values) {
			//if this is the first time around the while loop then the first value is both largest and smallest
			if (size_of_values==1) {
				cout << "The largest and smallest so far is " << measurement << unit_of_measurement <<  "\n";
				largestSoFar = centimeters;
				smallestSoFar = centimeters;
			// else determine if measurement is greater than largestSoFar or smaller than smallestSoFar (which were assigned the first time through the loop
			} else {
				if (centimeters > largestSoFar) {
					largestSoFar = centimeters;
				}
			if (centimeters < smallestSoFar) {
					smallestSoFar = centimeters;
				}
			}

		}
		cout << largestSoFar << "cm "  << " is the largest so far \n" << smallestSoFar << "cm " << " is the smallest so far: \n";
		cout << "End of Outside For Loop\n\n";
	} // end of for loop
	return 0;
}

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