Question

Trace Each of the following programs on the paper provided.

Program 1

User enters “cat”, “dog”, “chair”, “quit”

1. full = ""
2. count = 0
3. si = str(input("word: "))
4. while si != "quit":
5.     full = full + si
6.     count = count + 1
7.     si = str(input("word: "))
8. print(str(count) + " words")
9. print("Full: " + str(full));

Line Number

it doesn't have to be this specific table...

Answer 1

Solution:

------------------------

Line 1:

Declaring variable full and assign empty string ("") to it.

Line 2:

Declaring variable count and assign 0 to it.

Line 3:

Asking user to enter word. convert that input word into string using str() function. and assign that word to variable si.

Assume that user enter cat. thus si = cat.

Line 4:

This loop will run untill user enter quit.

Here si !=quit condition true so loop body will execute.

Line 5 - Concatenate si to full . thus full will now contain cat

Line 6- Adding 1 to count . count become 1.

Line 7- Asking user to enter word. convert that input word into string using str() function. and assign that word to variable si.

Assume that user enter dog

Go back to Line 4:-

Here si !=quit condition true so loop body will execute.

Line 5 - Concatenate si to full . thus full will now contain catdog

Line 6- Adding 1 to count . count become 2.

Line 7- Asking user to enter word. convert that input word into string using str() function. and assign that word to variable si.

Assume that user enter chair

Go back to Line 4:-

Here si !=quit condition true so loop body will execute.

Line 5 - Concatenate si to full . thus full will now contain catdogchair

Line 6- Adding 1 to count . count become 3.

Line 7- Asking user to enter word. convert that input word into string using str() function. and assign that word to variable si.

assume that user enter quit

Go back to Line 4:-

Here si !=quit condition fails. thus loop body will not execute.

Line 8:

convert count to string by using str(count) . concatenate it with " words" and print it.

So it will print 3 words

Line 9:

convert full to string by using str(full) concatenate it with Full and print result.

So it will print Full: catdogchair