10 typedef struct interval  struct
14 INTERVAL;  typedef
16 INTERVAL vmul(double, double, INTERVAL);
17 INTERVAL vdiv(double, double, INTERVAL);
22 int dcheck(INTERVAL);
25 INTERVAL vreg[26];
35 	INTERVAL vval;
42 %type <vval> vexp		/* interval expression */
119 			(void) printf("interval out of order\n");
249 static INTERVAL
252     /*  returns  the  smallest  interval  containing  a,  b,  c,  and  d  */  in hilo()
254     INTERVAL v;  in hilo()
284 INTERVAL
285 vmul(double a, double b, INTERVAL v)  in vmul()
291 dcheck(INTERVAL v)  in dcheck()
295 	printf("divisor  interval  contains  0.\n");  in dcheck()
301 INTERVAL
302 vdiv(double a, double b, INTERVAL v)  in vdiv()