Function that creates a different csv file every time it is run-CodePudding

I am making a c program that can save matrices and vectors in CSV files so I can then perform operations between them. In one of my functions I create a matrix with random numbers and then save it inside a CSV file.

The problem is that I don't know how to create a different file every time the function is run so each array can be stored in a different CSV file. Because of this I have to save all the matrices inside the same file which makes the rest of the process a lot harder. How could I make the function that makes a different file every time without it having completely random names.

Here is a link to the project in replit

CodePudding user response：

How could i make the function that makes a different file every time without it having completely random names.

Some possible solutions:

use timestamp as part of filename
use counter

For a timestamp, example code:

  char filename[80];
  snprintf(filename, sizeof(filename), "prefix.%d", time(NULL));
  FILE *fout = fopen(filename, "wt");

For a counter, use the same code as above, but check if the file prefix.${counter} exists (see man access). If it does, increment the counter and try again. If it doesn't, use the filename.