Saving files on C

I want to save files on computer.I can use fwrite commands.

But I have to enumarate files,like file01,file02, .. inside in the for cycle while saving using fwrite commands.

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So I have to save ;for example ten files (file01,fle02,file03....,file10...)

Could you advise me a simple example code?

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Inside a loop you need to

1. build the filaname
2. open the file
3. write data
4. close the file

C99 example (snprintf() is "new"), with lots of details omitted

for (j = 0; j < 10; j++) {
    snprintf(buf, sizeof buf, "file%02d.txt", j + 1);     /* 1. */
    handle = fopen(buf, "w");                             /* 2. */
    if (!handle) /* error */ exit(EXIT_FAILURE);          /* 2. */
    w = fwrite(data, 1, bytes, handle);                   /* 3. */
    if (w != bytes) /* check reason */;                   /* 3. */
    fclose(handle);                                       /* 4. */
}

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You need to open the files one by one with fopen, something like this:

char filename[128]; // (128-1) characters is the max filename length
FILE *file;

int i;
for (i = 0; i < 10; ++i) {
    snprintf(filename, 128, "file%02d", i);
    file = fopen(filename);

    // do stuff with file

    fclose(file);
}