Self Check

Concept Questions

1. What is the difference between cohesion and coupling?

2. Why is high cohesion desirable in a function?

3. What is meant by the term loose coupling?

Walkthroughs:

What is the output of the following program?

#include <stdio.h>

int apple(int count);
int banana(int count);
int carrot(int count);
int daikon(int count);
int edamame(int count);
int fig(int count);
int guava(int count);
int main(void)
{
	int final=0;
	final+=apple(0);
	printf("First final: %d\n", final);
	final += daikon(0);
	printf("Second final: %d\n", final);
}
int apple(int count){
	count += 1;
	printf("This");
	count += banana(count);
	printf(" nifty");
	count += carrot(count);
	printf(".\n");
	return count;
}
int banana(int count)
{
	count += 1;
	printf(" is a");
	return count;
}
int carrot(int count)
{
	count += 1;
	printf(" program");
	return count;
}
int daikon(int count)
{
	count += 1;
	printf("It");
	count += banana(0);
	count += carrot(0);
	count += edamame(0);
	return count;
}
int edamame(int count)
{
	count++;
	printf(" that");
	count += fig(0);
	printf("!\n");
	return count;
}
int fig(int count)
{
	count += 1;
	printf(" shows how the runtimestack");
	count += guava(0);
	return count;
}
int guava(int count)
{
	count += 1;
	printf(" works");
	return count;
}

Programming problem:

These functions can all be done by calculations using mathematical operators described in the previous chapters.

Programming 1:

Write the following function:

double metricHeight(int feet, int inches);

This function is passed the height of a person in feet and inches and will return the height of the person in centimeters.

1 foot = 12 inches 1 inch = 2.54 centimeters

Programming 2:

Write the following function:

int sum3Digits(int threeDigitNumber);

This function is passed a 3 digit number. You may assume that the number provided to the function is exactly 3 digits. This function returns the sum of the 3 digits in the number

Programming 3:

Write the following function:

double buy3GetOneFree(double unitPrice, int numUnits);

This function passed the unitPrice of a product and the number of units purchased. It returns the total price of a purchase that is on sale. For every 3 units bought, the customer can get one more for free. Thus the price of purchasing 3 items and the price of purchasing 4 items is the same. Similarly the price of 7 vs 8 items are also the same.