Question

#include

typedef struct
{
double width;
double length;
}RECTANGLE;
void swapLargestRectangleToArrayEnd(RECTANGLE *pCircles, int numCircles)
{
// to do
}
in the attached code, a structure rectangle is defined to represent a rectangle (specified via its width and length). an empty function which you need to implement is also given in the code, and you are not allowed to modify its input parameter list and return type. the function will take an input array of rectangles and swap the largest rectangle (in terms of area) with the final element of the array. for example, suppose in the main function, there is an array x of 5 rectangle-typed variables. then when calling the function by swaplargestrectangletoarrayend (x, 5); the largest rectangle in the array x is swapped to the end of x after the function call.

Answer 1

The function swapLargestRectangleToArrayEnd() swaps the largest rectangle with the last item in the array, based on the calculation of area by multiplying width and length. The largest area is found through iteration, and swapping is achieved by using a temporary variable to hold the value of the rectangle during the swap process.

Step-by-step explanation:

The student's question pertains to a function in C programming that involves manipulation of an array of structures. Specifically, the task is to swap the largest rectangle (based on area calculation) with the last rectangle in the array. To implement the swapLargestRectangleToArrayEnd() function, one must calculate the area of each rectangle, track the index of the rectangle with the largest area, and then swap the largest rectangle with the one at the end of the array.

Here is a sample implementation:

void swapLargestRectangleToArrayEnd(RECTANGLE *pRectangles, int numRectangles) {
int indexLargest = 0;
double maxArea = pRectangles[0].width * pRectangles[0].length;
for (int i = 1; i < numRectangles; i++) {
double area = pRectangles[i].width * pRectangles[i].length;
if (area > maxArea) {
maxArea = area;
indexLargest = i;
}
}
if (indexLargest != numRectangles - 1) {
RECTANGLE temp = pRectangles[numRectangles - 1];
pRectangles[numRectangles - 1] = pRectangles[indexLargest];
pRectangles[indexLargest] = temp;
}
}