Variables: Difference between revisions
68000 Assembly
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Puppydrum64 (talk | contribs) (68000 Assembly) |
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Multiple variables may be defined in a single line as follows:
<lang 11l>Int p, a, d</lang>
=={{header|360 Assembly}}==
;assignment, reference, referencing:▼
<lang 360asm>* value of F▼
L 2,F assigment r2=f▼
* reference (or address) of F▼
LA 3,F reference r3=@f▼
* referencing (or indexing) of reg3 (r3->f)▼
L 4,0(3) referencing r4=%r3=%@f=f</lang>▼
;declarations, initialization, datatypes:▼
<lang 360asm>* declarations length▼
C DS C character 1▼
X DS X character hexa 1▼
B DS B character bin 1▼
H DS H half word 2▼
F DS F full word 4 ▼
E DS F single float 4 ▼
D DS D double float 8▼
L DS L extended float 16▼
S DS CL12 string 12▼
P DS PL16 packed decimal 16▼
Z DS ZL32 zoned decimal 32▼
* declarations + initialization▼
CI DC C'7' character 1▼
XI DC X'F7' character hexa 1▼
BI DC B'11110111' character bin 1▼
HI DC H'7' half word 2▼
FI DC F'7' full word 4 ▼
EI DC F'7.8E3' single float 4 ▼
DI DC D'7.8E3' double float 8▼
LI DC L'7.8E3' extended float 16▼
SI DC CL12'789' string 12▼
PI DC PL16'7' packed decimal 16▼
ZI DC ZL32'7' zoned decimal 32</lang>▼
;scope▼
In BAL (Basic Assembler Language), variables are global and there is no scope.▼
=={{header|6502 Assembly}}==
===Declaration===
Line 97 ⟶ 133:
STA VRAM_DATA</lang>
=={{header|
Typically a variable is just a named memory location that exists in RAM. For ROM cartridge software, <code>equ</code> directives are used to assign names to memory locations. For programs that run from disk, which are loaded into RAM and executed from there, the <code>DC</code> directives can also be used, and then the programmer places a label in front of those directives.
▲;assignment, reference, referencing:
▲<lang 360asm>* value of F
▲ L 2,F assigment r2=f
▲* reference (or address) of F
▲ LA 3,F reference r3=@f
▲* referencing (or indexing) of reg3 (r3->f)
▲ L 4,0(3) referencing r4=%r3=%@f=f</lang>
▲;declarations, initialization, datatypes:
▲<lang 360asm>* declarations length
▲C DS C character 1
▲X DS X character hexa 1
▲B DS B character bin 1
▲H DS H half word 2
▲F DS F full word 4
▲E DS F single float 4
▲D DS D double float 8
▲L DS L extended float 16
▲S DS CL12 string 12
▲P DS PL16 packed decimal 16
▲Z DS ZL32 zoned decimal 32
▲* declarations + initialization
▲CI DC C'7' character 1
▲XI DC X'F7' character hexa 1
▲BI DC B'11110111' character bin 1
▲HI DC H'7' half word 2
▲FI DC F'7' full word 4
▲EI DC F'7.8E3' single float 4
▲DI DC D'7.8E3' double float 8
▲LI DC L'7.8E3' extended float 16
▲SI DC CL12'789' string 12
▲PI DC PL16'7' packed decimal 16
▲ZI DC ZL32'7' zoned decimal 32</lang>
▲;scope
▲In BAL (Basic Assembler Language), variables are global and there is no scope.
=={{header|8086 Assembly}}==
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