Check to see if a filename is a directory in C

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C

Linux

What I have to do is list all the files within a directory.
If a directory is shown then it also should print out the files within that directory.

At the moment I have:

DIR *directory;
struct dirent *files;
char folderPath[] = "//home//unix//20//";


 // Make sure I can open the folder "test" otherwise throw an error
     if ((directory = opendir(folderPath)) == NULL)
     {
        printf("\nCouldn't Open Folder!\n");
        return 0;
     }
	// Loop around and check if the directory is another directory
	int i = 0;
		while ((files = readdir(directory)) != NULL)
		{
		  //printf("%s\n", files->d_name);
		  if (files->d_name 
		  i++;
		}
	printf("\n");

This code prints out all the files and folders within that directory.

What I need to do now, is find out if d_name is a directory and if it is, print out the contents within that directory.

Can some-one help me on how I can do this?
Thank-You