... 7: 20 : case 8: 21 : case 10: 22 : case 12: 23 : count = 31; 24 : break; 25 : case 4: 26 : case 6: 27 : case 9: 28 : case 11: 29 : count = 30; 30: break; 31: case 2: 32: if (year % == 0) 33: count = 29 ; ... 11: 12: 13: 14: 15: 16: 17: 18: 19: 20 : 21 : 22 : 23 : 24 : 25 : 26 : } Continued total[0] = denver[0] + philadelphia[0]; total[1] = denver[1] + philadelphia[1]; total [2] = denver [2] + philadelphia [2] ; ... output: Point1: 20 0, 20 0 Point2: 20 0, 20 0 The following takes place in the first part of this program: n Line 5—Two Point variables are created n Line 6 A new Point object is assigned to pt1 n Line...