Question

I am using C to open a file for reading. I have this code :

fp = fopen("./settings.cfg","r");
if (fp != NULL)
    printf("OK");
else
    printf("ERROR");

but I always get an error.

The file is located in the folder where the executable resides. I have tried writing only “settings.cfg”. What might be the problem?

Answer 1

Try perror() to have the library itself tell you what, if anything, is wrong.

fp = fopen("./settings.cfg", "r");
if (fp != NULL)
    printf("OK\n");
else perror("fopen");