One effective method often used by programmers to comprehend the effect ofcode i
ID: 3731871 • Letter: O
Question
One effective method often used by programmers to comprehend the effect ofcode is 'tracing". Tracing is hand-executing the code in the same sequence and manner that the computer would execute the program. Often, the changes made to variables in the code are recorded in a trace table". Each row in the trace table records the values of the variables after a line of code has been hand-executed. For example, for the code holden 2 ford 13 mitsubishi 5 a completed trace table would be holden ford mitsubishi holden = 2 ford - 13 mitsubishi = 5 13 13 Your task is to trace execution ofthe following Python code digits= [1, 2, 3, 4] index = 0 answer- (digits [index] * 2-0) index -index 1 answe r = (index-digits [index]) index -index 1 answe r = (digits [index] 2-0) index-index1 answer- index-digits [index])Explanation / Answer
Here we will check the value digits[index] % 2
Now digits is an array having value 1 2 3 4
So we have
digits[0] = 1
digits[1] = 2
digits[2] = 3
digits[3] = 4
Let's see for each one by one
1) answer = digits[index]%2 == 0
index = 0
digits[0] = 1
1%2 is 1
1==0 is False so answer is False
Now index = index + 1
index = 1
2) answer = (index == digits[index])
index = 1
digits[1] = 2
1==2 is False so answer = False
Now index = index + 1
index = 1+1
index = 2
3) answer = (digits[index]%2 == 0)
digits[2] = 3
3%2 = 1
1 == 0 is False so answer = False
Now index = index +1
index = 2+1
index = 3
4) answer = (index == digits[index] )
index = 3
digits[3] = 4
3==4 is False so answer = False
digits
index
Answer
digits = [1,2,3,4]
[1,2,3,4]
-
-
index = 0
[1,2,3,4]
0
-
answer = (digits[index] % 2 == 0)
[1,2,3,4]
0
False
index = index + 1
[1,2,3,4]
1
False
answer = (index == digits[index])
[1,2,3,4]
1
False
index = index + 1
[1,2,3,4]
2
False
answer = (digits[index] % 2 == 0)
[1,2,3,4]
2
False
index = index + 1
[1,2,3,4]
3
False
answer = (index == digits[index])
[1,2,3,4]
3
False
digits
index
Answer
digits = [1,2,3,4]
[1,2,3,4]
-
-
index = 0
[1,2,3,4]
0
-
answer = (digits[index] % 2 == 0)
[1,2,3,4]
0
False
index = index + 1
[1,2,3,4]
1
False
answer = (index == digits[index])
[1,2,3,4]
1
False
index = index + 1
[1,2,3,4]
2
False
answer = (digits[index] % 2 == 0)
[1,2,3,4]
2
False
index = index + 1
[1,2,3,4]
3
False
answer = (index == digits[index])
[1,2,3,4]
3
False
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