Category:ALGOL 68: Difference between revisions

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Click "Expand" for more details.
Click "Expand" for more details.
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g
g
||Right hand side of:
||Right hand side of:
* Identity-declarations, as "~" in: <lang algol68>REAL x = ~</lang>
* Identity-declarations, as "~" in: <syntaxhighlight algol68>REAL x = ~</syntaxhighlight>
* Initialisations, as "~" in: <lang algol68>REAL x := ~</lang>
* Initialisations, as "~" in: <syntaxhighlight algol68>REAL x := ~</syntaxhighlight>
Also:
Also:
* Actual-parameters of calls, as "~" in:<lang algol68>PROC: sin(~)</lang>
* Actual-parameters of calls, as "~" in:<syntaxhighlight algol68>PROC: sin(~)</syntaxhighlight>
* Enclosed clauses of casts, as "~" in: <lang algol68>REAL(~)</lang>
* Enclosed clauses of casts, as "~" in: <syntaxhighlight algol68>REAL(~)</syntaxhighlight>
* Units of routine-texts
* Units of routine-texts
* Statements yielding VOID
* Statements yielding VOID
* All parts (but one) of a balanced clause
* All parts (but one) of a balanced clause
* One side of an identity relation, as "~" in: <lang algol68> ~ IS ~</lang>
* One side of an identity relation, as "~" in: <syntaxhighlight algol68> ~ IS ~</syntaxhighlight>
|bgcolor=aaaaff rowspan=4 width="50px"| deproc- eduring
|bgcolor=aaaaff rowspan=4 width="50px"| deproc- eduring
|bgcolor=aaeeaa rowspan=3 width="50px"| all '''soft''' then weak deref- erencing
|bgcolor=aaeeaa rowspan=3 width="50px"| all '''soft''' then weak deref- erencing
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|colspan=1 bgcolor=ffcccc|
|colspan=1 bgcolor=ffcccc|
Widening occurs if there is no loss of precision. For example: An INT will be coerced to a REAL, and a REAL will be coerced to a LONG REAL. But not vice-versa. Examples:
Widening occurs if there is no loss of precision. For example: An INT will be coerced to a REAL, and a REAL will be coerced to a LONG REAL. But not vice-versa. Examples:
<lang algol68>INT to LONG INT
<syntaxhighlight algol68>INT to LONG INT
INT to REAL
INT to REAL
REAL to COMPL
REAL to COMPL
BITS to []BOOL
BITS to []BOOL
BYTES to STRING</lang>
BYTES to STRING</syntaxhighlight>
A variable can also be coerced (rowed) to an array of length 1.
A variable can also be coerced (rowed) to an array of length 1.


For example:
For example:
<lang algol68>INT to [1]INT
<syntaxhighlight algol68>INT to [1]INT
REAL to [1]REAL</lang> etc
REAL to [1]REAL</syntaxhighlight> etc
|-
|-
!F<br>
!F<br>
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m
m
||
||
*Operands of formulas as "~" in:<lang algol68>OP: ~ * ~</lang>
*Operands of formulas as "~" in:<syntaxhighlight algol68>OP: ~ * ~</syntaxhighlight>
*Parameters of transput calls
*Parameters of transput calls
|colspan=3 bgcolor=ffcc99| Example:
|colspan=3 bgcolor=ffcc99| Example:
<lang algol68>UNION(INT,REAL) var := 1</lang>
<syntaxhighlight algol68>UNION(INT,REAL) var := 1</syntaxhighlight>
|-
|-
!M<br>
!M<br>
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* Trimscripts (yielding INT)
* Trimscripts (yielding INT)
* Enquiries: e.g. as "~" in the following
* Enquiries: e.g. as "~" in the following
<lang algol68>IF ~ THEN ... FI</lang> and
<syntaxhighlight algol68>IF ~ THEN ... FI</syntaxhighlight> and
<lang algol68>FROM ~ BY ~ TO ~ WHILE ~ DO ... OD etc</lang>
<syntaxhighlight algol68>FROM ~ BY ~ TO ~ WHILE ~ DO ... OD etc</syntaxhighlight>
* Primaries of calls (e.g. sin in sin(x))
* Primaries of calls (e.g. sin in sin(x))
|colspan=4 bgcolor=ffee99|Examples:
|colspan=4 bgcolor=ffee99|Examples:
<lang algol68>REF REF BOOL to BOOL
<syntaxhighlight algol68>REF REF BOOL to BOOL
REF REF REF INT to INT</lang>
REF REF REF INT to INT</syntaxhighlight>
|-
|-
!W<br>
!W<br>
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k
k
||
||
* Primaries of slices, as in "~" in: <lang algol68>~[1:99]</lang>
* Primaries of slices, as in "~" in: <syntaxhighlight algol68>~[1:99]</syntaxhighlight>
* Secondaries of selections, as "~" in: <lang algol68>value OF ~</lang>
* Secondaries of selections, as "~" in: <syntaxhighlight algol68>value OF ~</syntaxhighlight>
|colspan=5 bgcolor=aaeeaa|Examples:
|colspan=5 bgcolor=aaeeaa|Examples:
<lang algol68>REF BOOL to REF BOOL
<syntaxhighlight algol68>REF BOOL to REF BOOL
REF REF INT to REF INT
REF REF INT to REF INT
REF REF REF REAL to REF REAL
REF REF REF REAL to REF REAL
REF REF REF REF STRUCT to REF STRUCT</lang>
REF REF REF REF STRUCT to REF STRUCT</syntaxhighlight>
|-
|-
!S<br>
!S<br>
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f<br>
f<br>
t
t
|| The LHS of assignments, as "~" in: <lang algol68>~ := ...</lang>
|| The LHS of assignments, as "~" in: <syntaxhighlight algol68>~ := ...</syntaxhighlight>
|colspan=6 bgcolor=aaaaff| Example:
|colspan=6 bgcolor=aaaaff| Example:
* deproceduring of: <lang algol68>PROC REAL random: e.g. random</lang>
* deproceduring of: <syntaxhighlight algol68>PROC REAL random: e.g. random</syntaxhighlight>
|}
|}
For more details about Primaries and Secondaries refer to [[Operator_precedence#ALGOL_68|Operator precedence]].
For more details about Primaries and Secondaries refer to [[Operator_precedence#ALGOL_68|Operator precedence]].
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