The output of the code is "$810".
The expression "$" + f + 10 is evaluated as follows:
' f ' is an integer with the value of 8, so f + 10 evaluates to 18.
The string "$" is concatenated with the result of f + 10, resulting in the string "$18".
The final result is printed to the console using the println method, so the output is "$810".
The output of the code is "15".
The code sets the value of ' e ' to ' 12 ' in the first line, then re-assigns it to ' 15 ' in the second line. The final value of ' e ' is ' 15 '.
In the third line, the value of ' e ' is printed to the console using the ' println ' method, so the output is "15".
The expression j *= i + 2 means to multiply j by the value of i + 2 and assign the result back to j. So in this case, j becomes j * (i + 2) = 10 * (7 + 2) = 10 * 9 = 90.
In the third line, the values of i and j are concatenated with a space in between and printed to the console using the println method, so the output is "7 29".