#I'm trying to get this program to fill two 1d arrays of a defined size and then calculate some stats

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lusty sentinel
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Here are the assignment instructions. I have the c program attached.

Write a program and functions that will get 2 sets of random numbers from a random number
generator, average the 2 sets, and calculate the difference in the two averages. More specifically,
the program should do the following:

  1. Include these files: stdio.h, stdlib.h, and time.h
  2. Main function
    a. Define manifest constant NSIZE1 and NSIZE2 for the number of values in data
    sets 1 and 2, respectively. Set their values to 4 and 8, respectively.
    b. Declare arrays to hold the sets of random numbers. The arrays should be of type
    double.
    c. Include the statement:
    srand((unsigned int) time(0));
    before calling rand(). The call to srand() will initialize the random number
    generator; it should only be called one time. srand() is defined in stdlib.h and
    time() is defined in time.h.
    d. Fill the arrays with data by calling FillArray() which is a function that you write.
    e. Compute the average for each set of values by calling a dAvg() function which is
    another function that you create. This function should return the average as a
    double value and should accept a 1-dimensional array of values to be averaged.
    f. Determine the largest value in each set of data by calling a dMax() function that
    you write. dMax() should accepted a 1-dimensional array and return the
    maximum value as a double value.
    g. In your main function, print out the results in the following format:
    i. The number of data sets and the number of items in a data set.
    ii. For the first set of data, print its average, a colon, and then the values of its
    items on one line.
    iii. On the next line, print the second set’s average, a colon, and then the
    values of its items.
    iv. On the next line print the differences (set 1 – set 2) in the 2 sets’ average
    and maximum values. Be sure to clearly label your results.
  3. void FillArray(double vs[], int nVals); // Prototype
    a. Uses the following expression to fill the array with random data.
    rand()*10.0/RAND_MAX
    b. rand() is defined in stdlib.h and returns an integer value in the range of 0 to
    RAND_MAX.
    c. Does not return a value.(
  4. double dAvg(double vs[], int nVals); // Prototype
    a. Returns a double value containing the average value for an array of doubles that is
    passed to it.
  5. double dMax(double vs[], int nVals); // Prototype
    a. Returns a double value containing the maximum value in the array that is passed
    to it.

OUTPUT

PLACEHOLDER NAME

Analysis of Data. . .
Number of datasets: 2
Number of items in set 1: 4
Number of items in set 2: 8

(No return value, program will not close. Maybe has to do with one of the loops I have?)

📎 HW8.c
robust shadowBOT
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long ice
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First of all, by convention variables and functions should be camelCase, not PascalCase (i.e. first character shouldn't be capitalized).

sizeof(array) / 8 == NSIZE1
This check in your fillArray method already doesn't work. array is a pointer, so assuming you're on a 64-bit system it'll most likely return 8 for whatever it points to. This means sizeof(array) / 8 will probably always be 1.
The general approach to fix this is to also pass the length of the array, which also would drastically reduce your code's complexity.

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On a second check this is even shown in your assignment:
3. void FillArray(double vs[], int nVals); // Prototype

lusty sentinel
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This is very helpful actually, so because array is a pointer it has the standard value of a double, but if I passed an array with something like:

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Wait nevermind, are these checks unnecessary?

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@long ice Could I have an example?

long ice
long ice
lusty sentinel
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Of a check being passed. I'm kind of digesting right now and trying to rewrite some code.

long ice
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check that needs to be passed?

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In your assignment all the functions' signatures tell you, they expect a second parameter of type int, which probably describes the size of the array you're passing

lusty sentinel
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Okay, rewrote the code and it works

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I made it much more complicated than it needed to be. If anyone is wondering, here is the functioning code:

📎 HW8.c
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!solved

robust shadowBOT
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Thank you and let us know if you have any more questions!