Two's complement: Difference between revisions
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Puppydrum64 (talk | contribs) m (→{{header|C}}) |
Puppydrum64 (talk | contribs) |
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CLC |
CLC |
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ADC #1 ;result: #%10101011</lang> |
ADC #1 ;result: #%10101011</lang> |
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===16-bit=== |
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<lang 6502asm>myVar equ $20 |
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LDA #3 |
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STA myVar |
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LDA #0 |
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STA myVar+1 ;equivalent C: uint16_t myVar = 3; |
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negate: |
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LDA myVar+1 |
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EOR #255 |
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STA myVar+1 |
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LDA myVar |
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EOR #255 |
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STA myVar |
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CLC |
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ADC #1 |
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STA myVar |
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;this handles the case if we started with something where the low byte was zero. |
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LDA myVar+1 |
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ADC #0 |
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STA myVar+1</lang> |
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=={{header|Z80 Assembly}}== |
=={{header|Z80 Assembly}}== |
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