C-Program: Custom Library, Header File, and Implementation Files I have this mai

ID: 3781837 • Letter: C

Question

C-Program: Custom Library, Header File, and Implementation Files

I have this main.c file:

#include
#include
#include "stats.h"

int readGrades(char fileName[], float grades[]);

//Include this function prototype
void WelcomeToTheProgram();

int main()
{
     ///Declare Variables
     char fileName[30];
     float grades[1000]; //to store grades
     int i, ArrayCount[10] = {0}; //to store histogram counts

   /* Rewrite this line */
     int num_grades; //for # of grades in file

  ///Call Intro Comment
   WelcomeToTheProgram();

     ///Enter Filename
     printf(" Enter the data filename: ");
     scanf("%s", &fileName);

   //Get # of grades in file
   num_grades = readGrades(fileName, grades); //get # of grades in file

     ///Print Results
     printf("There are %d grades read ", num_grades);

printf("Mean = %f ", mean(grades, num_grades));

printf("Variance = %f ", variance(grades, num_grades));

printf("Maximum = %f ", maximum(grades, num_grades));

printf("Minumum = %f ", minimum(grades, num_grades));

//Call histogram

histogram(grades, ArrayCount, num_grades);

//Print the histogram

printf("Grade Histogram ");

for (i = 0; i < 10; i++)

{

if (i != 9)

{

printf(" %d %% - %d %%: %d ", i * 10, ((i + 1) * 10) - 1, ArrayCount[i]);

}

else

{

printf(" 90 %% - 100 %%: %d ", ArrayCount[i]);

}

return 0;

}
///Reads all grades from the file to array
int readGrades(char fileName[], float grades[])
{

FILE *fpin = fopen(fileName, "r");

int num_scores = 0;

float value;

if (fpin == NULL)

{

printf("Cannot open the file ");

exit(0);

     }
     while ((fscanf(fpin, "%f", &value)) != EOF)
     {

grades[num_scores] = value;

num_scores++;

}

return num_scores;

}

void WelcomeToTheProgram()
{
printf("***Welcome to the Program Which Involves a Custom Library***");

printf(" The program finds the minimum value, maximum value, mean,");

printf("variance, and a histogram of the grades of data by calling");

printf("implementation files min(), max(), mean(), variance(), and histogram(). ");

}

But, the only thing that prints is

Enter the data file name: grades.txt

There are 400 grades read.

Then the program just stops, it does not print the min, max, mean, variance, or histogram. Any ideas? Am I using the custom library wrong, the implementation files (for min, max, mean, variance, and histogram) all check out with no warnings or errors.

Here is stats.h:

#ifndef STATS_H
#define STATS_H

float minimum(float *grades[], int Size); // NOTE: You need to complete the prototypes
float maximum(float *grades[], int Size);
float mean(float *grades[], int Size);
float variance(float *grades[], int Size);
void histogram(float *grades[], int *ArrayCount, int Size);

#endif // STATS_H

And here is the grades file:

Explanation / Answer

//stats.h

#ifndef STATS_H
#define STATS_H

float minimum(float grades[], int Size); // NOTE: You need to complete the prototypes
float maximum(float grades[], int Size);
float mean(float grades[], int Size);
float variance(float grades[], int Size);
void histogram(float grades[], int ArrayCount[], int Size);

#endif // STATS_H

//min.c