can any one please answer to these below instruction questions?
1) How to pass paramters to the sub program? How it will be recieved by calling program? How the control is sent back to called program?
2)How to access array elemnts in assembler?
3)How to suppress leading zeros using edit instruction?
Joined: 06 Jun 2008 Posts: 8165 Location: East Dubuque, Illinois, USA
I am not an Assembler expert, but:
1. Set up an address block in memory. The first parameter's address goes at offset 0, the second parameter's address goes at offset 4, etc. The last address has the high-order bit set to '1' to indicate the end of the list. Load the address of block into register 1. The called program uses register 1 to load the parameter addresses. Under standard register conventions, register 14 contains the return address upon entry into the subroutine.
2. Trick question. There's no such thing as arrays, per se, in Assembler. All Assembler instructions use offsets from registers to determine addresses.
3. Look into the ED or EDMK instructions.