Program termination: Difference between revisions
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<lang XPL0>if Problem then exit 1; |
<lang XPL0>if Problem then exit 1; |
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</lang> |
</lang> |
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=={{header|Z80 Assembly}}== |
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This mostly depends on the hardware, but typically home computers would boot in BASIC and <code>CALL</code> the starting address on the disk. This means that the return address for BASIC is on top of the stack, and an <code>RET</code> will exit the program and return to BASIC, provided that execution is not inside one of the disk's subroutines. The example below is typical of a home computer such as the Amstrad CPC: |
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<lang z80>;assumes this runs inline |
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org &1000 ;program start |
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main: |
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call GetInput ;unimplemented input get routine, returns key press in accumulator |
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cp 'Y' ;compare to ascii capital Y |
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ret z ;return to BASIC if equal |
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jp main ;loop back to main</lang> |
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=={{header|zkl}}== |
=={{header|zkl}}== |
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