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

Write a C++ program that uses nested loops and one persistent counter to print the five rows of Floyd's triangle, with values continuing from 1 through 15. Print spaces between values and start a new line after each row.

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15