A3: Asmt#3: Map distances

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Write a C program to do the following.

Get the longitude, latitude, and place for origin and destination.
Calculate the distance from origin to destination.
Output diagnostics for origin and destination.
Output the distance from origin to destination.

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.

Map 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.

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 mapdistance.c.

Do not remove any comment that starts with three slashes.

Here is the C code.

/// File: mapdistance.c
/// Purpose: Map distances
/// 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: mapdistance.c
/// Purpose: Map distances
/// Author: (your name)
/// Help received:
// (add here)
/// pseudo-code:
// (add here)

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

int main() {
	///:BEGIN ToDo
	// declarations
	double dLat1;
	double dLong1;
	char place1[255];
	double dLat2;
	double dLong2;
	char place2[255];
	// input
	printf("Enter origin latitude, longitude, and place.\n");
	scanf("%lf %lf %[^\n]s",&dLat1,&dLong1,&place1);
	printf("You entered latitude %4.2lf, longitude %4.2lf, place \"%s\"\n",dLat1,dLong1,place1);
	printf("\n");
	printf("Enter destination latitude, longitude, and place.\n");
	scanf("%lf %lf %[^\n]s",&dLat2,&dLong2,&place2);
	printf("You entered latitude %4.2lf, longitude %4.2lf, place \"%s\"\n",dLat2,dLong2,place2);
	// process
	double rLat1 = M_PI * dLat1 / 180.0;
	double rLat2 = M_PI * dLat2 / 180.0;
	double rLong1 = M_PI * dLong1/ 180.0;
	double rLong2 = M_PI * dLong2 / 180.0;
	printf("\n");
	printf("Origin: %s\n",place1);
	printf("\t%4.2lf degrees is %6.4lf radians (latitude)\n",dLat1,rLat1);
	printf("\t%4.2lf degrees is %6.4lf radians (longitude)\n",dLong1,rLong1);
	printf("\n");
	printf("Destination: %s\n",place2);
	printf("\t%4.2lf degrees is %6.4lf radians (latitude)\n",dLat2,rLat2);
	printf("\t%4.2lf degrees is %6.4lf radians (longitude)\n",dLong2,rLong2);
	double radiusMiles1 = 3958.8;
	double distance1 = radiusMiles1*acos(sin(rLat1)*sin(rLat2)+cos(rLat1)*cos(rLat2)*cos(rLong2-rLong1));
	// output
	printf("\n");
	printf("The distance from %s to %s is %4.1lf miles.\n",place1,place2,distance1);
	///:END ToDo
	return 0;
	}

End solution

Here is the output of the C code.

Enter origin latitude, longitude, and place.
You entered latitude 39.97, longitude -76.73, place "York"

Enter destination latitude, longitude, and place.
You entered latitude 40.04, longitude -76.31, place "Lancaster"

Origin: York
	39.97 degrees is 0.6976 radians (latitude)
	-76.73 degrees is -1.3392 radians (longitude)

Destination: Lancaster
	40.04 degrees is 0.6988 radians (latitude)
	-76.31 degrees is -1.3319 radians (longitude)

The distance from York to Lancaster is 22.7 miles.

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

Here is an example input from file input1.txt.

39.97 -76.73 York
40.04 -76.31 Lancaster

For the above example input, here is the expected output.

Enter origin latitude, longitude, and place.
You entered latitude 39.97, longitude -76.73, place "York"

Enter destination latitude, longitude, and place.
You entered latitude 40.04, longitude -76.31, place "Lancaster"

Origin: York
	39.97 degrees is 0.6976 radians (latitude)
	-76.73 degrees is -1.3392 radians (longitude)

Destination: Lancaster
	40.04 degrees is 0.6988 radians (latitude)
	-76.31 degrees is -1.3319 radians (longitude)

The distance from York to Lancaster is 22.7 miles.

Here is an example input from file input2.txt.

39.97 -76.73 York
40.28 -76.88 Harrisburg

For the above example input, here is the expected output.

Enter origin latitude, longitude, and place.
You entered latitude 39.97, longitude -76.73, place "York"

Enter destination latitude, longitude, and place.
You entered latitude 40.28, longitude -76.88, place "Harrisburg"

Origin: York
	39.97 degrees is 0.6976 radians (latitude)
	-76.73 degrees is -1.3392 radians (longitude)

Destination: Harrisburg
	40.28 degrees is 0.7030 radians (latitude)
	-76.88 degrees is -1.3418 radians (longitude)

The distance from York to Harrisburg is 22.8 miles.

Here is an example input from file input3.txt.

39.97 -76.73 York
39.83 -77.23 Gettysburg

For the above example input, here is the expected output.

Enter origin latitude, longitude, and place.
You entered latitude 39.97, longitude -76.73, place "York"

Enter destination latitude, longitude, and place.
You entered latitude 39.83, longitude -77.23, place "Gettysburg"

Origin: York
	39.97 degrees is 0.6976 radians (latitude)
	-76.73 degrees is -1.3392 radians (longitude)

Destination: Gettysburg
	39.83 degrees is 0.6952 radians (latitude)
	-77.23 degrees is -1.3479 radians (longitude)

The distance from York to Gettysburg is 28.2 miles.

Here is an example input from file input4.txt.

39.97 -76.73 York
39.30 -76.61 Baltimore

For the above example input, here is the expected output.

Enter origin latitude, longitude, and place.
You entered latitude 39.97, longitude -76.73, place "York"

Enter destination latitude, longitude, and place.
You entered latitude 39.30, longitude -76.61, place "Baltimore"

Origin: York
	39.97 degrees is 0.6976 radians (latitude)
	-76.73 degrees is -1.3392 radians (longitude)

Destination: Baltimore
	39.30 degrees is 0.6859 radians (latitude)
	-76.61 degrees is -1.3371 radians (longitude)

The distance from York to Baltimore is 46.7 miles.

Pseudo-code is a "false" code. It is not really code, but a simplified English explanation that is somewhat similar to code. Pseudo-code is useful for understanding what a program does. For this work, the following can be used as the pseudo-code. Adjust if needed.

Get the longititude, latitude, and place for origin and destination.
Calculate the distance from origin to destination.
Output diagnostics for origin and destination.
Output the distance from origin to destination.

Note: Only some essential details are included. Some details, such as input, prompts, input echo, and obviously needed output are omitted.

The best way to copy-paste pseudo-code that includes indented code (e.g., with tabs) is as follows (in the code file) using a multi-line comment.

/* (pasted pseudo-code here) */

Two useful comments for this program would be the following.

A comment that a number is the radius of the earth in miles.

// radius of the earth in miles

A comment that the formula as an expression is the spherical law of cosines. Otherwise, most readers would not know what the expression represents.

// spherical law of cosines

The reader can always look up the spherical law of cosines (over 800,000 results on 2020-02-13).

CS 101 - A3 : Asmt#3: Map distances Your grade: _ / 40 [LATE] Late or redo penalty: _ / -40 [SUBMIT] Not submitted properly: _ / -40 [RUN] Does not compile, run-time crash, etc.: _ / -40 [ETHICS] Ethical issues: _ / -40 [HEADER] Header comments not done as required: _ / -20 [STYLE] Inconsistant style or indentation: _ / -20 [CODE] Code guidelines ignored: _ / -40 [XCODE] Code used not yet covered: _ / -20 [REMOVED] Triple slash comments removed: _ / -20 [ADDED] Code added outside of marked areas: _ / -20 [OUTPUT] Functional requirements met: _ / 40 [CREDIT] Extra credit: _ / +8 Comments: