3-7.c

一些简单的c51程序

#include <REG52.H>
#include <stdio.h>
void main (void) {

	int i,n;
	float s;

	SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1; 
	printf("please input n :");
	scanf("%d",&n);
	s = 0.0 ;
	for(i=1;i<=n;i++)
		s=s+(float)(i)*(float)(i);
	printf("1*1 + 2*2 +...+%d*%d = %f\n",n,n,s ) ;
    while (1) {};
}