11 typedef struct interval  struct
15 INTERVAL;  typedef
17 INTERVAL vmul(double, double, INTERVAL);
18 INTERVAL vdiv(double, double, INTERVAL);
20 int dcheck(INTERVAL);
23 INTERVAL vreg[26];
33 	INTERVAL vval;
40 %type <vval> vexp		/* interval expression */
117 			(void) printf("interval out of order\n");
268 static INTERVAL
271     /*  returns  the  smallest  interval  containing  a,  b,  c,  and  d  */  in hilo()
273     INTERVAL v;  in hilo()
303 INTERVAL
304 vmul(double a, double b, INTERVAL v)  in vmul()
310 dcheck(INTERVAL v)  in dcheck()
314 	printf("divisor  interval  contains  0.\n");  in dcheck()
320 INTERVAL
321 vdiv(double a, double b, INTERVAL v)  in vdiv()