Contains Operations and Move Percentage

Hi,

I am newbei in ABAP programming and rather stuck in these Problem, while doing a exercise.

Can any one explain me, how can i do it.

Problem 1:

<u><b>Move Percentage</b></u>

Data mc1(10) TYPE c VALUE 'ABCDEFGHIJ'.

<b>Use MOVE cmd with PERCENTAGE addition to display</b> output ‘ABCD’ left-aligned & right-aligned

Problem 2:

<u><b>Contains Operations</b></u>

Data test(50) type c value ‘Today is a wonderful day’.

<b>Check if it contains any numeric character</b>

Data num_var(6) type n value ‘12345’.

<b>Check if it contains all numeric values</b>

Also, Can u explain me OVERLAY String operation with a example. I am a bit confused in understanding this Operation.

Thanks in Advance.

Samir