Compound data type: Difference between revisions
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=={{header|Phix}}== |
=={{header|Phix}}== |
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===traditional sequence=== |
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The sequence is a natural compound data type. The following would be the same without the type point and declaring p as a sequence, apart from the run-time error. There would be no difficulty defining point to have a string and two atoms. |
The sequence is a natural compound data type. The following would be the same without the type point and declaring p as a sequence, apart from the run-time error. There would be no difficulty defining point to have a string and two atoms. |
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<lang Phix>enum x,y |
<lang Phix>enum x,y |
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point p = {175,3.375} |
point p = {175,3.375} |
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p[x] -= p[y]*20 |
p[x] -= p[y]*20 |
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puts(1,"point p is ") |
puts(1,"point p is ") |
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?p |
?p |
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printf(1,"p[x]:%g, p[y]:%g\n",{p[x],p[y]}) |
printf(1,"p[x]:%g, p[y]:%g\n",{p[x],p[y]}) |
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p[x] = 0 -- fine |
p[x] = 0 -- fine |
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p[y] = "string" -- run-time error</lang> |
p[y] = "string" -- run-time error</lang> |
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point p is {107.5,3.375} |
point p is {107.5,3.375} |
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p[x]:107.5, p[y]:3.375 |
p[x]:107.5, p[y]:3.375 |
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C:\Program Files (x86)\Phix\test.exw: |
C:\Program Files (x86)\Phix\test.exw:12 |
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type check failure, p is {0,"string"} |
type check failure, p is {0,"string"} |
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--> see C:\Program Files (x86)\Phix\ex.err |
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Press Enter... |
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</pre> |
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===classes=== |
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{{libheader|Phix/Class}} |
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You could also use a class |
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<lang Phix>class point |
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public atom x,y |
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end class |
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point p = new({175,3.375}) |
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p.x -= p.y*20 |
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printf(1,"p.x:%g, p.y:%g\n",{p.x,p.y}) |
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p.x = 0 -- fine |
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p.y = "string" -- run-time error</lang> |
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{{out}} |
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<pre> |
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p.x:107.5, p.y:3.375 |
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C:\Program Files (x86)\Phix\test.exw:9 |
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type error assigning "string" to point.y |
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--> see C:\Program Files (x86)\Phix\ex.err |
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Press Enter... |
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</pre> |
</pre> |
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