在Python中计算平均值？

Question

the question is:

Ask the user how many children she has. Input the ages for each child (ensuring that the value is a number between 0 and 100). Calculate and output the average age of the user's children.

and here is what I have so far:

child = int(input("How many children do you have?"))
count = 1
total = 0
if child > 100:
    print("Invalid!")
else:
    while count <= 11:
        n = int(input("Enter child #%s" %str(count)+ " age:"))
        count += 1
        total += n

    print("Average age:", total/child)

I can't set the numbers of children. for instance, when I input 3 or 7 children for the question (How many children do you have?), it still lets me input ages for 11 children. I know I have set it to <= 11 but I don't know how else to do it?? Also, this is my attempt for a while-loop , I still need to do it using a for-loop ?? And does it look alright overall?

Answer 1

You answered your own question. while count <= 11: is resulting to go loop for 11 times.

Replace: while count <= 11 with while count <=child

Answer 2

If I'm reading your problem correctly. When it asks the user for number of children you are storing it in the child variable and then you are using it to compare to the maximum age of the child(100). Which isn't correct. After getting the child variable input from the user you should use a for loop along with the range() functionlike this:

child = int(input("How many children do you have?"))
total =0
for num in range(child):
     n = int(input("Enter child age:"))
     if n > 100:
         print "error"
     total+=n

Then take the total and avg it with child. The num variable doesn't have to be defined because Python will do it for you in the for loop. Hope this helps

Answer 3

Change

while count <= 11:

to

while count <= child:

You are looping only 11 times, you have to loop until <= child times.

Answer 4

Let me help you by providing the right code and explaining to you how it works:

child = int(input("How many children do you have?"))
count = 1
total = 0
if child > 100:
    print("Invalid!")
else:
    while count <= child:
        n = int(input("Enter child #%s" %str(count)+ " age:"))
        count += 1
        total += n

print("Average age:", total/child)

The condition count <= child checks if we have taken all children in consideration or not. You could easily change it to a for loop:

child = int(input("How many children do you have?"))
total = 0
if child > 100:
    print("Invalid!")
else:
    for count in range(child): # This start counting from 0
        n = int(input("Enter child #%s" %str(count)+ " age:"))
        total += n

print("Average age:", total/child)

This loop actually repeats itself numChildren times, as many as we wanted it to. For some documentantion about range please check this link.

Also, since you'd most probably want to have a proper input for child you can write the following piece of code to force the user enter a proper input:

child = int(input("How many children do you have?"))
count = 1
total = 0
while child > 100:
    print("Invalid!")
    child = int(input("How many children do you have?"))

while count <= child:
    n = int(input("Enter child #%s" %str(count)+ " age:"))
    count += 1
    total += n

print("Average age:", total/child

Answer 5

Use child instead of 11 .

To use a for loop, you can get rid of the count counter and just do for i in range(child): .

Answer 6

Strange that none of the provided answers checks if the given number of children greater that zero. And nobody has thought that the average age is in most cases not an integer.

You have to check if child > 0 and calculate the final result as float

child = int(input("How many children do you have?"))
count = 1
total = 0
if child <= 0 or child > 100:
    print("Invalid!")
else:
    while count <= child:
        n = int(input("Enter child #%s" %str(count)+ " age:"))
        count += 1
        total += n

    print("Average age:", float(total)/float(child))