3-10.c

一些简单的c51程序

#include <REG52.H>              
#include <stdio.h> 
#include <math.h>                
void main (void) 
{
	
	double s,t,x;
	int n;
	printf("please input x :");
	scanf("%lf",&x);
	t = x;
	n=1;
	s = x;
	SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1; 
	
	do
	{
		n = n + 2 ;
		t = t * ( - x * x ) / ( (float)(n) - 1 ) / (float)(n) ;
		s = s + t ;
	}while(fabs(t)>=1e-7);
	printf("sin(%f )=%lf",x,s);
    while(1) {};
}