### Matrix 5x5 Hi everyone,

I just started studying programming at University level and this is the first course.

I just encountered the task below and I'm getting a little bit confused to say the least.

The task is the following "
The C++ program below reads from the file matrix.txt integers table inserting it in the 5x5 table (matrix ). The program prints the matrix on screen, calculates the sum of the elements and prints the sum on screen making use of functions print_matrix () and count_sum(). Your task is to make up the functions in question. The values situated on the rows are separated by space."

Does this mean I need to have the file "matrix.txt" or where am I supposed to get the values to the matrix from?

The result should look like following:

Matrix:
11 2 4 5 6
9 8 7 6 5
1 2 3 4 5
11 22 33 44 55
1 2 4 5 0
Sum of elements: 255

 ``1234567891011121314151617181920212223242526272829`` `````` #include #include using namespace std; void print_matrix(int matrix); int calculate_sum(int matrix); int main(void) { int matrix; int sum; ifstream file("matrix.txt"); if (!file){ cout << "File cannot be opened!"; } else { for (int y=0; y<5;y++){ for (int x=0;x<5;x++){ file >> matrix[y][x]; } } file.close(); cout << "Matrix:" << endl; print_matrix(matrix); sum = count_sum(matrix); cout << "Sum of elements: " << sum << endl; } } `````` Does this mean I need to have the file "matrix.txt"

Yes. You are given the values. Simply save them to a file named matrix.txt. you should have been provided with the input file.
if you were not, you can make one in a simple text editor like notepad in windows, just put some values in it and keep going. Thanks guys.

Well actually I am only supposed to provide the functions and upload them to my schools system so basically I shouldn't even need to have the .txt file .

The code I wrote in my original message was handed to me and now my task is to create functions void rint_matrix(int matrix); and int calculate_sum(int matrix);

The whole task seems a bit weird to me tbh :D I shouldn't even need to have the .txt file .

You will need the file to test your program.

The assignment is not really weird. The purpose is to make sure you understand how to navigate a 2D array. ``12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849`` ``````#include #include using namespace std; void print_matrix(int matrix); int calculate_sum(int matrix); int main(void) { int matrix; int sum; ifstream file("matrix.txt"); if (!file) { cout << "*** File cannot be opened!\n"; exit(1); } else { for (int y=0; y<5;y++) { for (int x=0;x<5;x++) { file >> matrix[y][x]; cout << y << ',' << x << '=' << matrix[y][x] << '\n'; } } file.close(); cout << "Matrix:" << endl; print_matrix(matrix); sum = calculate_sum(matrix); cout << "Sum of elements: " << sum << endl; } } void print_matrix(int matrix) { cout << "1 Fill this part out with a program\n"; } int calculate_sum(int matrix) { int sum{0}; cout << "2 Fill this part out with a program\n"; return sum; }``````

matrix.txt
 ```11 2 4 5 6 9 8 7 6 5 1 2 3 4 5 11 22 33 44 55 1 2 4 5 0 ```
Last edited on For both of these functions, you need a nested loop. Have a look at how this is done for reading from the file (L18-22 OP) and modify what's done in the inner-loop as needed.
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