Data commit

Task/Conditional-structures/Z80-Assembly/conditional-structures-1.z80

@@ -0,0 +1,9 @@
+char x;
+if (x == 20)
+{
+   doThis();
+}
+else
+{
+   doThat();
+}

Task/Conditional-structures/Z80-Assembly/conditional-structures-2.z80

@@ -0,0 +1,8 @@
+cp 20
+jr nz,Else
+   call doThis
+   ;execution returns here after the call
+   jr done
+Else:
+   call doThat
+done

Task/Conditional-structures/Z80-Assembly/conditional-structures-3.z80

@@ -0,0 +1,5 @@
+if (x == 20)
+{
+   DoSomething();
+}
+// rest of program

Task/Conditional-structures/Z80-Assembly/conditional-structures-4.z80

@@ -0,0 +1,3 @@
+cp 20
+call z,DoSomething
+;rest of program

Task/Conditional-structures/Z80-Assembly/conditional-structures-5.z80

@@ -0,0 +1,14 @@
+ld a,(HL)   ;switch (HL)
+ cp 1        ;case (1)
+ jr nz,+     ;branch to next colon (note: not all assemblers support this syntax)
+    call HL_EQUALS_1
+:
+ cp 2        ;case (2)
+ jr nz,+     ;branch to next colon
+    call HL_EQUALS_2
+:
+ cp 50
+ jr nz,+
+    call HL_EQUALS_50
+:
+ ;rest of program

Task/Conditional-structures/Z80-Assembly/conditional-structures-6.z80

@@ -0,0 +1,17 @@
+ld a,(HL)   ;switch (HL)
+ cp 1        ;case (1)
+ jr nz,+     ;branch to next lone colon
+    call HL_EQUALS_1
+    jr done  ;You could also write "jr +++"
+:
+ cp 2        ;case (2)
+ jr nz,+     ;branch to next lone colon
+    call HL_EQUALS_2
+    jr done  ;you could also write "jr ++"
+:
+ cp 50
+ jr nz,+
+    call HL_EQUALS_50
+:
+done:
+ ;rest of program

Task/Conditional-structures/Z80-Assembly/conditional-structures-7.z80

@@ -0,0 +1,10 @@
+Dispatch: ;remember, you need to CALL this address for it to work properly. Otherwise your program will most likely crash.
+add a  ;this is a table of 16-bit values, so multiply the index by 2.
+ld a,(hl)    ;get the low byte of the function addr. you wish to call
+push af
+   inc hl
+   ld a,(hl) ;get the high byte of the function addr. you wish to call
+   ld H,a    ;store the high byte in H
+pop af
+ld L,a       ;store the low byte in L
+jp (HL)      ;now you've jumped to the desired function. Its RET will return execution to the instruction just after "CALL Dispatch"