Create a trace table to determine the values of the variables in each step of the following program when a value of 3 is entered.

PHP

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes $a $b $c $d
1 $a = trim(fgets(STDIN)) User enters value 3 3 ? ? ?
2 $b = a + 10 3 13 ? ?
3 $a = $b * ($a - 3) 0 13 ? ?
4 $c = 3 * $b / 6 0 13 6.5 ?
5 $d = $c * $c 0 13 6.5 42.25
6 $d-- 0 13 6.5 41.25
7 echo $d The value 41.25 is displayed

Java

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes a b c d
1 a = Double.parseDouble(cin.readLine()) User enters value 3 3 ? ? ?
2 b = a + 10 3 13 ? ?
3 a = b * (a - 3) 0 13 ? ?
4 c = 3 * b / 6 0 13 6.5 ?
5 d = c * c 0 13 6.5 42.25
6 d-- 0 13 6.5 41.25
7 System.out.println(d) The value 41.25 is displayed

C++

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes a b c d
1 cin >> a User enters value 3 3 ? ? ?
2 b = a + 10 3 13 ? ?
3 a = b * (a - 3) 0 13 ? ?
4 c = 3 * b / 6 0 13 6.5 ?
5 d = c * c 0 13 6.5 42.25
6 d-- 0 13 6.5 41.25
7 cout << d The value 41.25 is displayed

C#

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes a b c d
1 a = Double.Parse(Console.ReadLine()) User enters value 3 3 ? ? ?
2 b = a + 10 3 13 ? ?
3 a = b * (a - 3) 0 13 ? ?
4 c = 3 * b / 6 0 13 6.5 ?
5 d = c * c 0 13 6.5 42.25
6 d-- 0 13 6.5 41.25
7 Console.Write(d) The value 41.25 is displayed

Visual Basic

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes a b c d
1 a = Console.ReadLine() User enters value 3 3 ? ? ?
2 b = a + 10 3 13 ? ?
3 a = b * (a - 3) 0 13 ? ?
4 c = 3 * b / 6 0 13 6.5 ?
5 d = c * c 0 13 6.5 42.25
6 d -= 1 0 13 6.5 41.25
7 Console.Write(d) The value 41.25 is displayed

 

Python

Solution

For the input value of 3, the trace table looks like this.

Step Statement Notes a b c d
1 a = float(input()) User enters value 3 3 ? ? ?
2 b = a + 10 3 13 ? ?
3 a = b * (a - 3) 0 13 ? ?
4 c = 3 * b / 6 0 13 6.5 ?
5 d = c * c 0 13 6.5 42.25
6 d -= 1 0 13 6.5 41.25
7 print(d) The value 41.25 is displayed

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