using C++

4. Use nested loops that display the following patterns in four separate programs: Pattern A Pattern B Pattern Pattern D 1 1 2 3 4 5 6 1 1 2 3 4 5 6 12 1 2 3 4 5 1 2 3 4 5 123 1234 321 1234 1234 123 4321 123 12345 12 54 321 1 2 3 4 5 6 6 5 4 3 2 1 21 12 1 1