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- /*------------------------------------------------------------------------------
- CSAMPLE1.C
-
- Copyright 1995 KEIL Software, Inc.
- ------------------------------------------------------------------------------*/
-
- #include <reg51.h> /* define 8051 registers */
- #include <stdio.h> /* define I/O functions */
-
- extern int getnumber ();
- extern output (int);
-
- main () { /* main program */
- int number1, number2; /* define operation registers */
- bit operation; /* define operation */
-
- SCON = 0x52; /* SCON */ /* setup serial port control */
- TMOD = 0x20; /* TMOD */ /* hardware (2400 BAUD @12MHZ) */
- TCON = 0x69; /* TCON */
- TH1 = 0xf3; /* TH1 */
-
- printf ("\n\nC compiler demonstration program\n\n");
-
- while (1) { /* repeat forever */
- number1 = getnumber (); /* read number1 */
- number2 = getnumber (); /* read number2 */
- printf ("Input operation: '+' (ADD) or '-' (SUB) ? ");
- operation = (getchar () == '+'); /* get operation */
- output (operation ? (number1 + number2) /* perform operation */
- : (number1 - number2) );
- }
- }
-