C - printf() not working but puts() is working fine

Question

void read_class_information(head* beginning, int scale_type) {
    puts(\"hello\");
    // printf(\"hello\");
}

I have a simple function called by main

Answer 1

By default, stream buffering is set to line buffered, which means nothing is really sent to the stream until a new line character \n is found. The three buffering methods are:

• _IONBF: unbuffered
• _IOLBF: line buffered
• _IOFBF: full buffered

You can change the buffering method for any stream. In this case, you may want to change the buffering method for stdout:

setvbuf(stdout, (char *)NULL, _IONBF, 0);

In this way, you don't need to fflush(stdout); everytime you want to print something without a newline. This has some performance issues which may or not affect to you, so you decide which is better for you.

As usual, you have access to the documentation executing man setvbuf (if you have the docs installed, of course).