In the C language, I need an experienced programmer to implement two more topics to my already functioning program.

Please include output terminal, and compile using gcc, Thank you!

Topics to add to the program(Pick 2):

Structures Linked Lists (Pointers) Recursion Stack/Queue Header Files

I have used the following topics in my program:

Strings 2D Arrays File I/O Command Line Arguments Pass by Reference and sorting.

Here is my program source code:

#include

#include

#include

//function to sort the elements of an 2D array row wise

void sort(int **arr, int n) {

//(1) sorting each row elements

int a;

for (int i = 0; i < n; ++i) {

for (int j = 0; j < n; ++j) {

for (int k = (j + 1); k < n; ++k) {

if (arr[i][j] > arr[i][k]) {

a = arr[i][j];

arr[i][j] = arr[i][k];

arr[i][k] = a;

}

}

}

}

}

//functio to read the string(line) from a file

int read_line(FILE *in, char *buffer, size_t max) {

return fgets(buffer, max, in) == buffer;

}

int main(int argc, char *argv[]) {

//(1)checking for the command line argument

//handling command line arguments count

if (argc != 2) {

printf("Specify the file name");

return 0;

}

//(2)handling string here

//(1)And reading the values passed from command line argument

char* file = argv[1];

printf("File names passed from command line arguments is: %s ", file);

//Here fixing the 2D array size, if you want you can changeit

//but at the same time you need add that many columns in the data.txt file

int n = 4;

// (3)Handling 2D arrays

int **array;

array = malloc(n * sizeof(int *));

//checking if the memory is allocated or not

if (array == NULL) {

printf("Out of memory ");

exit(1);

}

//allocating memory for each field in the array

for (int i = 0; i < n; i++) {

array[i] = malloc(n * sizeof(int));

if (array[i] == NULL) {

printf("Out of memory ");

exit(1);

}

}

// Open the file data.txt to read the 2D array data.

//(4)Handling the files concept here

FILE *pFile = fopen(file, "r");

if (pFile == NULL) {

//printing error if there is any issue with file

printf("Error: Unable to open the file");

exit(1);

}

//reading the matrix into 2D array

int x;

for (int i = 0; i < n; i++) {

for (int j = 0; j < n; j++) {

fscanf(pFile, " %d", &x);

array[i][j] = x;

}

}

//printing the 2D array

printf(" 2D Array read from file is: ");

for (int i = 0; i < n; i++) {

for (int j = 0; j < n; j++) {

printf("%d ", array[i][j]);

}

printf(" ");

}

//(5)passing the 2D array as Pass by Reference

sort(array, n);

//printing the results

printf(" 2D Array after sorting each row in ascending order is: ");

for (int i = 0; i < n; i++) {

for (int j = 0; j < n; j++) {

printf("%d ", array[i][j]);

}

printf(" ");

}

// Deallocate 2D array

for (int i = 0; i < n; i++) {

free(array[i]);

}

free(array);

array = NULL;

//Reading a string from the text file and printing its length

}

// Close files