CAT_HUMAN_RATIO = 7
MIN_AGE = 0
MAX_AGE = 114
print("This program determines your age in cat years")
humanAge = -1
while (humanAge < MIN_AGE) or (humanAge > MAX_AGE):
    humanAge  = int(input("Enter your age (%d - %d years): " %(MIN_AGE, MAX_AGE)))
    if (humanAge < MIN_AGE) or (humanAge > MAX_AGE):
        print("Age must be in the range of (%d - %d years):" %(MIN_AGE, MAX_AGE))

catAge = humanAge / CAT_HUMAN_RATIO
print("%d in human years is %.1f in cat years" %(humanAge, catAge))