dectobit.cpp

自己做的c库函数

#include <stdio.h>
#include <iostream.h>
template<class T>
bool dectobit(T num,char *buf,int len)
{
	unsigned long i=1;
	unsigned int tmp;
	int size=sizeof(T);
	if(8*size!=len)
		return 0;
	
	for(int j=0;j<size*8;j++)
	{
          tmp=(num|(i<<j));
		  if(tmp&~num)
			  buf[len-j]='0';
		  else
			  buf[len-j]='1';
	}
	return 1;
}
void main()
{
	int k=156789;
	char buf[32];
	dectobit(k,buf,32);
	cout<<buf<<endl;
}
////?0000000000000100110010001110101d.
////              100110010001110101