C++ coding, i just need the readfiles to work properly, the requirements are below, the code i use in the middle then the output. Please help me to understand the read file and the return

Lab lesson 10 part 1 is worth 50 points (40 points for the tests and 10 for the formatting, comment and variable names). As always, failure to meet the requirements will result in a reduction from the points from the tests.

This program will read the contents of a file into an array and calculate various values based on the contents of the file.

The program will make use of a two dimensional array that has 20 rows and 5 columns.

You will be reading in the contents from a file. You will need to read the file name from cin.

The file will consist of up to 20 sets of 5 values. The values will all be double floating point values.

readFile function

One function you will be required to have is called readFile. This function will read the input file. Each read will read in 5 columns of information into the next available row in the two dimensional array. The first 5 values are read into row 0, the next 5 values will be read into row 1, and so on up to 20 rows of input. You will need to keep track of how many rows of input you have read in. This could be anywhere from 0 to 20. If there are more than 20 rows of input you should only read in the first 20 rows.

To help facilitate this you need to create a global const int value for the maximum number of columns.

Your program should use thisconst value when creating the arrays or when defining function prototypes and function headers.

You will also be creating a const int value for the maximum number of rows, but this will be in your main function.

You should not be hard coding 5 or 20 in your code anywhere except in the two const int declarations. The only possible exception to this is the readFile function. It is easier to just read in all 5 columns at a time. If you want to just read in an entire row at a time you can do that in the readFile function. It is possible to write your code to use the MAX_COLUMNS value and read in one value at a time, but it makes the program logic more difficult. Once you have your code working and submitted you might want to see if you can read in the values using MAX_COLUMNS and reading in just one value at a time. This enhancement is not required for the assignment.

No other use of global variables is allowed.

Here is an example of some partial code:

... const int MAX_COLUMNS = 5; // read input file and populate the array int readFile(double values[][MAX_COLUMNS], int maxRows, string inputFileName); ... int main() { const int MAX_ROWS = 20; string inputFileName; double grades[MAX_ROWS][MAX_COLUMNS]; ... int actualRows = readFile(grades, MAX_ROWS, inputFileName); ... } ... 

Note that in the above code we are not including the max number of rows in the array when we pass it as the parameter on the readFile function. That is done so we could use the readFile function for different arrays with a different number of possible rows.

The readFile function will open the file and read the data into the passed in array. It will also close the file once it has read in the data. If the file cannot be opened the function should return -1 to the calling function. If the file does not contain any data (or contains less than 5 values) it will return 0. Otherwise the function returns the number of row read, up to 20. The file could contain more than 20 rows of data, but you should only read in the first 20. Do not try to read into the array past the valid limits of the array.

main processing

In this program you are going to read in the file name from cin. The file name will be passed to the readFile function. If the file exists the input file will contain 0 or more rows. The readFile function will return -1 if the file does not exist and 0 to MAX_ROWS depending on how many rows of data were actually in the file.

Assume a file name of badfile.txt. If the file does not exist you should output the following message from main:

File "badfile.txt" could not be opened 

and exit the program.

Assume now that input file grades.txt exists but does not contain any valid data. The number of rows returned from readFile is 0. Output the following message from main:

The input file "grades.txt" did not contain any data 

and exit the program.

If there are 1 to 20 rows the program should:

Calculate and display the average of all of values read into the array

Calculate and display the average for every column in the array

Find and display the smallest value for every row in the array

You will need to have different functions to:

Calculate the average for the array

Calculate the average for a specified column

Find the smallest value in a specified row

You can have additional functions if you want them, but you must have main, readFile and the 3 listed above.

The signature for the get average functions are:

// for the array double average(double values[][MAX_COLUMNS], int numberRows); // for a specified column (column) double columnAverage(double values[][MAX_COLUMNS], int column, int numberRows); 

There will be unit tests for readFile, average, and columnAverage.

The signatures for other functions are up to you.

See the sample runs for the output requirements. The averages and smallest values must all be written with two digits to the right of the decimal point.

The main function will be the driver. It should create the array, read in the file name, and call all of the other functions, processing the logic as required.

Sample run 1 (valid data)

Contents of cin:

grades1.txt 

Contents of grades1.txt:

61.4 89.5 62.6 89.0 100.0 99.5 82.0 79.0 91.0 72.5 

Here is the output to cout:

Processing 2 rows, and 5 columns Average for all values is 82.65 Average for column 0 is 80.45 Average for column 1 is 85.75 Average for column 2 is 70.80 Average for column 3 is 90.00 Average for column 4 is 86.25 Smallest value for row 0 is 61.40 Smallest value for row 1 is 72.50 

Sample run 2 (invalid file name)

Contents of cin:

badfile.txt 

Here is the output to cout:

File "badfile.txt" could not be opened 

Sample run 3 (value, but empty file)

Contents of cin:

grades.txt 

Here is the output to cout:

The input file "grades.txt" did not contain any data 

Sample run 3 (valid flle that contains more than 20 rows, only read in first 20)

Contents of cin:

grades2.txt 

Contents of grades2.txt:

 10.0 20.0 30.0 40.0 50.0 100.0 90.0 80.0 70.0 60.0 95.0 85.0 75.0 65.0 55.0 25.2 27.2 29.3 31.2 33.2 88.9 78.8 68.7 58.6 48.5 10.1 20.1 30.1 40.1 50.1 100.1 90.1 80.1 70.1 60.1 95.1 85.1 75.1 65.1 55.1 25.2 27.3 29.4 31.3 33.3 88.0 78.9 68.8 58.7 48.6 10.9 20.8 30.7 40.6 50.5 100.9 90.8 80.7 70.6 60.5 95.9 85.8 75.7 65.6 55.5 25.8 27.7 29.6 31.5 33.4 88.7 78.6 68.5 58.4 48.3 20.0 30.0 40.0 50.0 60.0 90.0 80.0 70.0 60.0 50.0 85.0 75.0 65.0 55.0 45.0 45.2 47.2 49.3 51.2 53.2 48.9 58.8 68.7 78.6 88.5 85.0 75.0 65.0 55.0 45.0 

Here is the output to cout:

Processing 20 rows, and 5 columns Average for all values is 57.21 Average for column 0 is 62.45 Average for column 1 is 59.86 Average for column 2 is 57.24 Average for column 3 is 54.58 Average for column 4 is 51.94 Smallest value for row 0 is 10.00 Smallest value for row 1 is 60.00 Smallest value for row 2 is 55.00 Smallest value for row 3 is 25.20 Smallest value for row 4 is 48.50 Smallest value for row 5 is 10.10 Smallest value for row 6 is 60.10 Smallest value for row 7 is 55.10 Smallest value for row 8 is 25.20 Smallest value for row 9 is 48.60 Smallest value for row 10 is 10.90 Smallest value for row 11 is 60.50 Smallest value for row 12 is 55.50 Smallest value for row 13 is 25.80 Smallest value for row 14 is 48.30 Smallest value for row 15 is 20.00 Smallest value for row 16 is 50.00 Smallest value for row 17 is 45.00 Smallest value for row 18 is 45.20 Smallest value for row 19 is 48.90 

Make sure you close your input file and make sure you do not go past the end of the array.

Error message "Could not find main function"

Now that we are using functions some of the tests are unit tests. In the unit tests the zyBooks environment will call one or more of your functions directly.

To do this it has to find your main function.

CODE:

#include #include #include using namespace std; const int MAX_COLUMNS = 5; const int MAX_ROWS = 20;

int readFile(double values[][MAX_COLUMNS], int rows, string inputFileName); int main(){ string inputFileName; double grades[MAX_ROWS][MAX_COLUMNS]; double averageAll = avg(grades, MAX_ROWS);

// Setting the precision cout << setprecision(2) << fixed << showpoint; cin >> inputFileName;

int rows = readFile(grades, MAX_ROWS, inputFileName); if (rows == -1){ cout << "File \"" << inputFileName << "\" could not be opened" << endl;}

else if (rows == 0){ cout << "The input file \"" << inputFileName << "\" did not contain any data" << endl;}

else{ if (rows > 20) rows = 20; double tot = 0.0, avg = 0.0; for (int i = 0; i < rows; i++){ for (int j = 0; j < MAX_COLUMNS; j++){ tot += grades[i][j];} } avg = tot / ((rows) * (MAX_COLUMNS)); cout << "Processing " << rows << " rows, and " << MAX_COLUMNS << " columns" << endl; cout << "Average for all values is " << avg << endl; for (int i = 0; i < MAX_COLUMNS; i++){ avg = 0; tot = 0; for (int j = 0; j < rows; j++){ tot += grades[j][i];} avg = tot / rows; cout << "Average for column " << i << " is " << avg << endl;}

double min; for (int i = 0; i < rows; i++){ min = grades[i][0]; for (int j = 0; j < MAX_COLUMNS; j++){ if (min > grades[i][j]) min = grades[i][j];} cout << "Smallest value for row " << i << " is " << min << endl;} } return 0;}

int readFile(double grades[][MAX_COLUMNS], int rows, string inputFileName){ ifstream dataIn; //data in int i = 0, j = 0; //counters

dataIn.open(inputFileName.c_str()); // Opening the input file

if (dataIn.fail()){ //if it fails, output failure message return -1;}

else{ double grade; while (dataIn >> grade){

if (j == 5){ j = 0; i++;} grades[i][j] = grade; j++;}

if (i == 0){ dataIn.close(); return 0;}

dataIn.close(); return i + 1;} }

OUTPUT

1: Compare output keyboard_arrow_up 4 / 4

Input

badfile.txt

Your output

File "badfile.txt" could not be opened

2: Compare output keyboard_arrow_up

4 / 4

Input

grades.txt

Your output

The input file "grades.txt" did not contain any data

3: Compare output keyboard_arrow_up

4 / 4

Input

grades1.txt

Your output

Processing 2 rows, and 5 columns Average for all values is 82.65 Average for column 0 is 80.45 Average for column 1 is 85.75 Average for column 2 is 70.80 Average for column 3 is 90.00 Average for column 4 is 86.25 Smallest value for row 0 is 61.40 Smallest value for row 1 is 72.50

4: Unit test keyboard_arrow_up

4 / 4

Test readFile with a file with 0 rows

Test feedback

readFile correctly returned 0 for empty file

5: Unit test keyboard_arrow_up

0 / 4

Test readFile with a file with 1 row

Test feedback

readFile returned a value of 0 when it should have been 1

6: Unit test keyboard_arrow_up

4 / 4

Test readFile with 20 rows

Test feedback

readFile correctly returned 20 rows read

7: Unit test keyboard_arrow_up

0 / 4

Test readFile with 21 rows

Test feedback

readFile returned a value of 21 when it should have been 20

8: Compare output keyboard_arrow_up

0 / 4

Input

grades2.txt

Your output

Processing 20 rows, and 5 columns Average for all values is 57.21 Average for column 0 is 62.45 Average for column 1 is 59.86 Average for column 2 is 57.24 Average for column 3 is 54.58 Average for column 4 is 51.94 Smallest value for row 0 is 10.00 Smallest value for row 1 is 60.00 Smallest value for row 2 is 55.00 Smallest value for row 3 is 25.20 Smallest value for row 4 is 48.50 Smallest value for row 5 is 10.10 Smallest value for row 6 is 60.10 Smallest value for row 7 is 55.10 Smallest value for row 8 is 25.20 Smallest value for row 9 is 48.60 Smallest value for row 10 is 10.90 Smallest value for row 11 is 60.50 Smallest value for row 12 is 55.50 Smallest value for row 13 is 25.80 Smallest value for row 14 is 48.30 Smallest value for row 15 is 20.00 Smallest value for row 16 is 50.00 Smallest value for row 17 is 45.00 Smallest value for row 18 is 45.20 Smallest value for row 19 is 48.90 *** stack smashing detected ***: ./a.out terminated

Expected output

Processing 20 rows, and 5 columns Average for all values is 57.21 Average for column 0 is 62.45 Average for column 1 is 59.86 Average for column 2 is 57.24 Average for column 3 is 54.58 Average for column 4 is 51.94 Smallest value for row 0 is 10.00 Smallest value for row 1 is 60.00 Smallest value for row 2 is 55.00 Smallest value for row 3 is 25.20 Smallest value for row 4 is 48.50 Smallest value for row 5 is 10.10 Smallest value for row 6 is 60.10 Smallest value for row 7 is 55.10 Smallest value for row 8 is 25.20 Smallest value for row 9 is 48.60 Smallest value for row 10 is 10.90 Smallest value for row 11 is 60.50 Smallest value for row 12 is 55.50 Smallest value for row 13 is 25.80 Smallest value for row 14 is 48.30 Smallest value for row 15 is 20.00 Smallest value for row 16 is 50.00 Smallest value for row 17 is 45.00 Smallest value for row 18 is 45.20 Smallest value for row 19 is 48.90

9: Unit test keyboard_arrow_up

0 / 4

Test average function

Compilation failed

Compilation failed

lesson10part2.cpp: In function bool testPassed(): lesson10part2.cpp:46:48: error: average was not declared in this scope double averageAll = average(values, MAX_ROWS); ^ lesson10part2.cpp: In function int readFile(double (*)[5], int, std::__cxx11::string): lesson10part2.cpp:124:48: warning: unused parameter rows [-Wunused-parameter] int readFile(double grades[][MAX_COLUMNS], int rows, string inputFileName){ ^~~~

10: Unit test keyboard_arrow_up

0 / 4

Test columnAverage function

Compilation failed

Compilation failed

lesson10part2.cpp: In function bool testPassed(): lesson10part2.cpp:46:57: error: columnAverage was not declared in this scope double averageAll = columnAverage(values, 2, MAX_ROWS); ^ lesson10part2.cpp: In function int readFile(double (*)[5], int, std::__cxx11::string): lesson10part2.cpp:124:48: warning: unused parameter rows [-Wunused-parameter] int readFile(double grades[][MAX_COLUMNS], int rows, string inputFileName){ ^~~~