Exercise

1. Open the built-in bplong dataset. Using a loop and an extended macro function, display for each variable the sentence “The variable label of [insert variable name] is [insert variable label].”. Use the trace command to see what your loop does in each iteration.
2. Build three versions of a loop that displays the sum of 2 and each number between 1 and 10 separately: first using foreach, then using forvalues and finally while. Use as many shortcuts as possible.
3. Use one version of the loop from 6 as a nested loop, i.e. a loop within another loop. Instead of displaying only the sum of 2 and each number between 1 and 10, the code should also display the sum of 3 and each number between 1 and 10, and the sum of 4 and each number between 1 and 10.