L7: Lab#7: Vectors

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Write a C program to do the following.

The first number in the data is a show parameter that should be handled as done in previous works.

Write a C program to read in units and the number of pairs of points that follow as vectors. Determine the length of each vector. At the end, output the total length of all the vectors.

Note: Some of the example data represent regular polygons, so some of the lengths will always be the same for a given set of data, but you should not assume this. If the requirements are unclear in any way, use any provided input and output to resolve the discrepancy.

See Guidelines for C programs .

Domain knowledge is the background knowledge that is useful in solving a problem, designing a solution, implementing the solution, etc. The following domain knowledge may be useful for this requirement.

Euclidean distances

Note: In addition to specific domain knowledge, you should be familiar with all concepts covered to this point in the course.

The following coding examples and/or notes may be of use for this requirement.

Advice: Try to separate the input from the processing. In order to do so, you will need to use . In general, you will need for each and every variable that is needed from the input that will be used in the processing and/or output part.

C: Loops for input

Use the "+=" or "-=" (or similar) operators when they can be used. For example incrementing a counter or adding to a sum. It is best to not use the "++" or "--" operators except within for loops (where for loops are the best choice).

Use a while loop where a while loop is best. There is a major deduction for using a for loop when not appropriate. A for loop is best for going 0 to n-1 or from 1 to n or the other way.

All code should be written in single-entry single-exit style. This means no continue or break statements in loops and all return statements need to be at the end of a function (as in the main function).

For all works, there is a major deduction for submitting a program that does not terminate. For example, a program that contains an infinite loop.

Make all necessary assumptions. Make no unnecessary assumptions.

In addition to specific coding examples, you should be familiar with all concepts covered to this point in the course.

You are provided with the following starter program in file vectors.c.

Do not remove any comment that starts with three slashes.

Here is the C code.

/// File: vectors.c
/// Purpose: Vectors
/// Author: (your name)
/// Help received:
// (add here)
/// pseudo-code:
// (add here)

#include <stdio.h>
#include <math.h>

int main() {
	///:BEGIN ToDo

	///:END ToDo
	return 0;
	}

You are to fill in the missing parts of the program according to the work requirements (see above).

In the comments at the top, you are to fill in the author (your name), help received (person and type of help), and pseudo-code parts which are not in the solution (usually provided, but you need to add them). Remove the parentheses too.

Begin solution

Here is a possible solution to the above problem. Note: Once a solution is provided, or the day before the next class, further submissions for this work receive no credit.

/// File: vectors.c
/// Purpose: Vectors
/// Author: (your name)
/// Help received:
// (add here)
/// pseudo-code:
// (add here)

#include <stdio.h>
#include <math.h>

int main() {
	///:BEGIN ToDo
	// declarations
	int show1;
	char units1[256];
	double x1;
	double y1;
	double x2;
	double y2;
	double dx;
	double dy;
	double lengthOne1;
	double lengthAll1;
	int pairsPos1;
	int pairsLen1;
	// input
	scanf("%d\n",&show1);
	if (show1 > 1) {
		printf("Enter units.\n");
		}
	scanf("%[^\n]s",&units1);
	if (show1 > 1) {
		printf("You entered \"%s\" for units.\n",units1);
		}
	if (show1 > 1) {
		printf("\n");
		printf("Enter number of pairs of points.\n");
		}
	scanf("%d",&pairsLen1);
	if (show1 > 1) {
		printf("You entered %d for pairs of points.\n",pairsLen1);
		printf("\n");
		printf("Enter %d pairs of points.\n",pairsLen1);
		}
	lengthAll1 = 0.0;
	// input and process data list
	pairsPos1 = 0;
	while (pairsPos1 != pairsLen1) {
		pairsPos1 += 1;
		if (show1 > 1) {
			printf("\n");
			printf("Enter four numbers for two points (x1, y1) and (x2, y2).\n");
			}
		scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
		if (show1 > 1) {
			printf("You entered numbers for points (%0.3lf,%0.3lf) and (%0.3lf,%0.3lf).\n",x1,y1,x2,y2);
			}
		dx = x2 - x1;
		dy = y2 - y1;
		lengthOne1 = sqrt(dx*dx + dy*dy);
		if (show1 > 0) {
			printf("%d. Vector #%d point (%0.3lf,%0.3lf) to point (%0.3lf,%0.3lf) has length %0.3lf %s.\n",pairsPos1,pairsPos1,x1,y1,x2,y2,lengthOne1,units1);
			}
		lengthAll1 += lengthOne1;
		}
	// output results
	printf("\n");
	printf("The length of the %d pairs of points is %0.3lf %s\n",pairsLen1,lengthAll1,units1);
	///:END ToDo
	return 0;
	}

End solution

Here are some examples of input and output for the above program code.

Here is an example input from file input1.txt.

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