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carraysfopen

how do I open files using an array in c

I want to open file named ex1, ex2, ex3 ...exn etc. Now when i put the value of n like, n=1, ex1 will be opened for, n=2, ex2 file will be opened and then I will read or write my c program output array from or into it. can the name of the file be given as a string?

As I am new with programing please help me to solve this problem.

Solution

  • Normally when you open a file you use the function fopen

    fp = fopen ("file.txt", "w+");
if (fp == NULL)
{
    exit(1); // Or you can raise some error code and return if this code is in a function.       
}
// Process the file

    Now in your case, you need to manipulate the filename. So you can take a C string for this.

    char filename[10];

// N is set from code above

sprintf(filename,"ex%d",N);
fp = fopen (filename, "w+");

// Further behaviour is same