Need help fixing my code in C.

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The question states:

A 3000 lb vehicle travelling on a road at 100 ft/sec requires a force equal to its mass times its acceleration to stop ( F = ma).
The acceleration is given by
a= (v_o^2-v_i^2)/2d

Where vi = 100 ft/sec
vo = 0 ft/sec.
Write a program that will calculate the retarding force needed to stop the car at distances of 10, 20, 30, 40, 50, …, 1000 ft. Display the distance value and the corresponding retarding force in tabular form. The units of force are Newtons (N). Your solution must include a user-defined function that returns the force and takes as input initial and final velocity and distance.
double force(double velocityInitial, double velocityFinal, double distance, double mass);

Not sure how to fix the errors i got which are:

26: 'mass' is used uninitialized in this function
26: 'acceleration' is used uninitialized in this function
30: 'distance' is is used uninitialized in this function

What I have tried:

My code is:

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

double force(double velocityInitial, double velocityFinal, double distance, double mass);

int main()
{

double forceFormula;
int distance, mass, acceleration;

forceFormula = mass * acceleration;

printf("\nDistance:\t\tForce in Newtons:\n"
"------------------------------------------\n");
printf("%d\t\t\t%.2lf\n", distance, forceFormula);
printf("------------------------------------------\n");

return 0;
}

double force(double velocityInitial, double velocityFinal, double distance, double mass)
{
velocityInitial = 100;
velocityFinal = 0;
mass = 3000;

double acceleration, forceFormula;

for( distance = 10; distance <= 1000; distance += 10)
{

acceleration = ((velocityFinal * velocityFinal) - (velocityInitial * velocityInitial))/ 2 * distance;

forceFormula = mass * acceleration;
}

return forceFormula;

}

Posted 15-Mar-20 11:19am

Member 14770192

Updated 18-Mar-20 2:30am

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OriginalGriff · Answer 1 · 2020-03-15T11:49:00

This is your fourth question, and the third today: all with the same problem.

And that's simple: you aren't thinking, you're trying to get others to do that for you. And that's a bad idea because you don't learn by looking at others work - you learn by doing something for yourself.

So, I'm not going to tell you what code you need to fix: instead, I'm going to point you at a permanent solution. Google for the name of your C system (probably an IDE) and the word "debugger" and start reading how to use it. The debugger will enable to you watch what your code is doing while it is running, looking at variable & memory contents and where flow control is actually going - and why. It's the best tool in your box, so get used to using it - it's where you are going to spend a lot of your development time.

So get yourself to Google, and start using the debugger.

Patrice T · Answer 2 · 2020-03-15T12:45:00

Quote:
Need help fixing my code in C.

No ! There is nothing to fix because you didn't stated any problem.
You obviously have learned nothing from the 3 previous questions.

When you ask for help, you have to say what is your problem, giving complete error messages is the minimum.
If you read carefully the error messages, you will see that the compiler don't just say 'you have an error ! na nana na ...", The compiler try to tell you the kind of error the best it can and it also gives you a position. This should narrow the search for a solution.

You need to learn how to exploit those error messages, search on documentation for details on the error.

I guess you will have to learn debugger pretty soon too. It is incredible helpful to understand what is unexpected in your code running.

[Update]

Quote:
I'm not sure what it was about the question that made you guys angry

You are not listening the comments done.

Quote:
I guess I'm not the only one that doesn't like C as much.

That is why not everyone have a C compiler on its computer and if have 1 installed, it is not necessary the same as yours.

Quote:
I'm not sure where your confusion lies when you say that "there is nothing to fix because you didn't stated any problem."

No confusion, sarcasm because your didn't stated a problem, so, no problem, no fix. :)

you finally added the error messages, 26 and 30 are the lines numbers where errors are. Problem, in your code the lines with the errors are 13 and 17.
This means that the errors comes from another program, they don't match.
This will not motivate helpers.

Quote:
I am confused as to what the errors even mean, or how to even fix them.

Google is your friend, paste the compiler name and error message, you will get a lot of explanations.

Advice: do not learn by solving problems, find a tutorial and follow it, do exercises, experiment, this way you will learn the basics.

CPallini · Answer 3 · 2020-03-15T21:35:00

You should love C, instead of disliking it. :-)
Try

C

#include <stdio.h>


double force( double vo, double vi, double d, double m);

int main()
{
  const double M = 3000;
  const double Vo = 100;
  const double Vi = 0;

  printf("\nDistance:\t\tForce in Newtons:\n");

  for (double d = 10.0 ; d < 1010.0; d+=10.0)
  {
    double f = force( Vo, Vi, d, M);
    printf("\t%4.0f\t\t%7.3f\n", d, f);
  }
  return 0;
}

double force( double vo, double vi, double d, double m)
{
  double f = (vo*vo-vi*vi)/2.0/d;
  return f;
}

Stefan_Lang · Answer 4 · 2020-03-18T02:31:00

1. Try harder when specifying the topic name. Everyone posting a qquestion here needs help. That is not useful information.

2. Try harder understanding your compiler. The messages it sent you are clear enough and not hard to understand, or fix. Think! Look up the documentation of the compiler if needed.

3. Learn the basics. Really, the things you have issues with are at the very bottom of programming in general, and C specifically. It doesn't make sense for me or anyone else to provide you with a specific answer to this program - what you need is learn and understand the raw basics of programming! Understanding requires thinking, no one else can do that for you!

Need help fixing my code in C.

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