Ubuntu based program wont compile

I am learning C language via "C For Dummies" and am writing a program for Ubuntu. I have written the program but cannot compile it. I installed a gcc, wrote the program and thought I was in the correct folder. The program is named Goodbye.c. The code is written as follows:

#include <stdio.h>

int main()
{
   printf(Goodbye, cruel world!\n");
   return(0);
}

When I attempt to enter the command gcc goodbye.c -o goodbye I am given the message

gcc: error: goodbye.c: No such file or directory
gcc: fatal error: no input files compilation terminated.

What am I doing wrong? How do I get the program to compile correctly in order for me to be able to run it?

Ubuntu is case sensitive, unlike Windows. Therefore goodbye.c is different from Goodbye.c.

Also, if that is your exact code, you will get another error:

printf(Goodbye, cruel world!\n");

needs an opening quote; it should be

printf("Goodbye, cruel world!\n");