Thread: Need help finishing a few functions.

Hello I am a beginner with C programming and just now getting to conditionals. I have my entire program shelled out but many of the functions I have no clue how to write out and implement can anyone help?

Here is an example run through of the program.

"Enter the positive mass for 3 particles: "(user input)"4.5 1.2 18.0""
Max mass: 18.000
Mean mass: 7.900
Mass at 0: 4.500
Mass at 1: 1.200
Mass at 2: 18.000"

Here is my program so far. Apologies for any spacing errors copying and pasting . Thanks in advance for the help.

Code:

#include <stdio.h>
#include <stdlib.h>
#define TRUE 1
#define FALSE 0

double maxOf3(double* numbers);

double meanOf3(double* numbers);

int validateAll(double* masses);

int validateMass(double* masses, int index);

void writeMass(double* masses, int index);

int main(void){

  double masses[3];

  printf("Enter the positive mass for 3 particles: ");
  scanf("%lf%lf%lf", &masses[0], &masses[1], &masses[2]);

  if (!validateAll(masses)) {

     return EXIT_FAILURE;
  }

  printf("Max mass: %.3lf\n", maxOf3(masses));
  printf("Mean mass: %.3lf\n", meanOf3(masses));

  writeMass(masses, 0);
  writeMass(masses, 1);
  writeMass(masses, 2);

  return EXIT_SUCCESS;

}

int validateAll(double* masses){
    return EXIT_FAILURE;
  }

  printf("Max mass: %.3lf\n", maxOf3(masses));
  printf("Mean mass: %.3lf\n", meanOf3(masses));

  writeMass(masses, 0);
  writeMass(masses, 1);
  writeMass(masses, 2);

  return EXIT_SUCCESS;

}

int validateAll(double* masses){

   int rvalue = 0;

   rvalue = rvalue + validateMass(masses,0);
   rvalue = rvalue + validateMass(masses,1);
   rvalue = rvalue + validateMass(masses,2);

   if ( rvalue >= 3){
      return TRUE;
   }

   else {
      return FALSE;
   }
}

int validateMass(double* masses, int index){

   if(masses[index] > 0){
      return TRUE;
   }
}
void writeMass(double* masses, int index){

}

double maxOf3(double* numbers){

}

double meanOf3(double* numbers){

}

Oh I've done whats there already but don't really know how to start the others =\ . And yup its homework but I thought asking questions about it are allowed. I don't want anyone to do it for me but instead maybe give me an idea of how one of the empty functions I have are supposed to be coded. Was sick last week and missed most of the lesson on this so I am really clueless here lol

Lol no I really know nothing about this. And Mo is short for Morgan not Mr.

I have a hard time believing you even tried. If, as you asserted, you actually wrote that main function, and both validateAll functions (and the garbage code in between the two validateAll functions), you have more than enough skills to code writeMass at the very least. Also, think about how you would determine the others if you had to do it by hand. How do you figure out the largest of 3 values step by step? What about the mean?

I wrote that with the help of a teacher. And I've been absent for a week so things have slipped my mind. Why waste both of our time to come in here to insult my work and imply that I am lying? I can tell your last questions are there to help me think about it but I don't know the ways to tell the program to run it.

Sorry if I seem like a slacker just thought a C programming board could.. well you know help me with C programming....

Okay, so the writeMass function is going to use a printf statement, probably not too different from those you used in your main function. Then describe for me in English how you would determine the maximum and mean values for 3 numbers.

I didn't expect you to be and I thought I made myself clear I am having trouble starting my unfinished functions. I have no good idea how to start them...

Ok so printf. And the maximum would of course be the highest of the 3 numbers listed while the mean would be the sum of the 3 numbers divided by 3. How do I put that into C?

I thought the mean is the average....

No book(professor is weird) or classmates that I have spoken to but that link looks helpful thank you. Sorry if I seemed lazy and just looking for someone to code it for me in my earlier post but I am very new to this and honestly have no clue how to start it. I will look into that link and hopefully find some info to get started. Thanks again.

Yes, mean is the average. You'll learn a lot more by reading and doing rather than by copy-pasting, so dig around the web for C tutorials, and get yourself a good book, even if the class doesn't require it. We have some recommendations here: C Book Recommendations. As a hint, Quzah's mathematical description of average in post #11 is remarkably close to how it will look in C.