sin(x).cpp

计算机网络安全中的DES加密解密算法

#include <iostream.h>
#include <iomanip.h>
#include <math.h>

void dtostr(double x,char *s)
{
	char cc[]="0123456789ABCDEF";
	int i,k;
	for (i=0;i<8;i++)
	{
		x*=16;
		k=int(x);
		s[i]=cc[k];
		x-=k;
	}
	s[i]='\0';
}

void main()
{
   double x,y;
   char s[9];
   cout.precision(16);
   for (int i=0;i<5;i++)
   {
	   x=1.0+i;
	   y=sin(x);
	   if (y<0.0) y=-y;
	   dtostr(y,s);
	   cout<<"|sin("<<x<<")|="<<y<<"=0."<<s<<"H\n";
   }
}
/*
|sin(1)|=0.841470984807897=0.D76AA478H
|sin(2)|=0.909297426825682=0.E8C7B756H
|sin(3)|=0.141120008059867=0.242070DBH
|sin(4)|=0.756802495307928=0.C1BDCEEEH
|sin(5)|=0.958924274663138=0.F57C0FAFH
*/