里面包含很多c语言的源码

				/* Demonstrates printer output. */
				/* stdprn is not ANSI Standard */
				#include 
				
				int main( void )
				{
				    float f = 2.0134;
				
				    fprintf(stdprn, "\nThis message is printed.\r\n");
				    fprintf(stdprn, "And now some numbers:\r\n");
				    fprintf(stdprn, "The square of %f is %f.", f, f*f);
				
				    /* Send a form feed. */
				    fprintf(stdprn, "\f");
				
				    return 0;
				}