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BSD 4.1

/*
	the call
		x = frexp(arg,&exp);
	must return a double fp quantity x which is <1.0
	and the corresponding binary exponent "exp".
	such that
		arg = x*2^exp
*/

double
frexp(x,i)
double x;
int *i;
{
	int neg;
	int j;
	j = 0;
	neg = 0;
	if(x<0){
		x = -x;
		neg = 1;
		}
	if(x>1.0)
		while(x>1){
			j = j+1;
			x = x/2;
			}
	else if(x<0.5)
		while(x<0.5){
			j = j-1;
			x = 2*x;
			}
	*i = j;
	if(neg) x = -x;
	return(x);
	}

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