pointfunc1.c

来自「单片及c语言轻松入门的随书光盘」· C语言 代码 · 共 25 行

#pragma code symbols debug oe
#include <reg51.h> /* special function register declarations */
#include <stdio.h> /* prototype declarations for I/O functions */
void func1(int d) { /* function #1 */
	printf("In FUNC1(%d)\n", d);
}
void func2(int i) { /* function #2 */
	printf("In FUNC2(%d)\n", i);
}
void main(void) {
	void (*f)(int i); /* Declaration of a function pointer */	
	/* that takes one integer arguments */
	/* and returns nothing */
	SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */
	TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */
	TH1 = 0xf3; /* TH1: reload value for 2400 baud */
	TR1 = 1; /* TR1: timer 1 run */
	TI = 1; /* TI: set TI to send first char of UART */
	while( 1 ) {
	f = (void *)func1; /* f points to function #1 */
	f(1);
	f = (void *)func2; /* f points to function #2 */
	f(2);
	}
}