Skip to main content

Solution to Self Check

Concept Questions​

Q1: What is the difference between cohesion and coupling?​

  • Cohesion describes the relationship of the code within a function
  • Coupling describes the relationship between functions.

Q2: Why is high cohesion desirable in a function?​

A function that is highly cohesive is dedicated to a clear single objective. Every line of code is working towards the completion of that objective. It makes the function precise and understandable.

Q3: What is meant by the term loose coupling?​

A function is loosely coupled if they are not dependent on each other. That is, each function can work on their own without needing to be paired to another function.

Walkthrough:​

output of program:

This is a nifty program.
First final: 7
It is a program that shows how the runtimestack works!
Second final: 13

Programming​

Programming 1:​

double metricHeight(int feet, int inches)
{
	double totalInches = feet * 12 + inches;
	double result = totalInches * 2.54;
	return result;
}

Programming 2:​

int sum3Digits(int threeDigitNumber)
{
	int digit1;
	int digit2;
	int digit3;

	//left most digit.. example 923/100 = 9
	digit1 = threeDigitNumber/100;
	//middle digit... example 923/10 = 92.  92%10 = 2
	digit2 = (threeDigitNumber/10) % 10;
	//last digit ... example 923%10 = 3
	digit3 = threeDigitNumber%10;
	return digit1 + digit2 + digit3;
}

Programming 3:​

double buy3GetOneFree(double unitPrice, int numUnits)
{
	int fourFullUnits;
	int leftOvers;
	double totalPrice;

	//every 4 units is charged as if 3 units were bought.
	//because division is truncated, only get number
	//of 4 full units in this calculation.  Example if there were 9 units,
	//this would be 9/4 = 2.
	fourFullUnits = numUnits/4;

	//this is the number of units that are essentially not part of the sale
	leftOvers = numUnits%4;

	totalPrice = unitPrice*3*fourFullUnits + leftOvers*unitPrice;
	return totalPrice;
}