Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Build values from 4 and 2, reserve capacity for at least four elements, append 7, 1, and 9, then print the elements, size, and observed capacity. The program must not rely on the final capacity being exactly 8.

Elements: 4 2 7 1 9
Size: 5
Capacity: 8