Data commit

Task/Flow-control-structures/Z80-Assembly/flow-control-structures-1.z80

@@ -0,0 +1,7 @@
+PrintString:
+ld a,(hl)       ;HL is our pointer to the string we want to print
+cp 0            ;it's better to use OR A to compare A to zero, but for demonstration purposes this is easier to read.
+ret z           ;return if accumulator = zero
+call PrintChar  ;prints accumulator's ascii code to screen - on Amstrad CPC for example this label points to memory address &BB5A
+inc hl          ;next char
+jr PrintString  ;jump back to the start of the loop. RET Z is our only exit.

Task/Flow-control-structures/Z80-Assembly/flow-control-structures-2.z80

@@ -0,0 +1,12 @@
+foo:
+push af
+bar:
+ld a,(hl)
+cp 255
+jr z,exit
+inc hl
+jr bar
+
+exit:
+pop af
+ret

Task/Flow-control-structures/Z80-Assembly/flow-control-structures-3.z80

@@ -0,0 +1,3 @@
+loop:
+    ;your code goes here
+    DJNZ loop

Task/Flow-control-structures/Z80-Assembly/flow-control-structures-4.z80

@@ -0,0 +1,9 @@
+_LDIR:
+ld a,(hl)
+ld (de),a
+inc hl
+inc de
+dec bc
+ld a,b
+or c         ;compare BC to zero
+jr nz,_LDIR  ;Game Boy doesn't have LDIR so you'll have to use this code instead.