SPL to HP C/XL Migration Guide (30231-90001)

6-5
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| | Formats 2a and 4a deal with the case where |
|| step-val is positive. Formats 2b and 4b |
| | handle the case where step-val is negative. |
| | There is no easy way to combine the |
| | formats. |
|| |
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In HP C/XL, the three expressions can actually contain multiple
expressions, separated by commas. The last or right-most becomes the
value of the expression. This is the method used to solve the SPL "*"
alternative, in formats 3 and 4. An arbitrary variable,
flag is set to
1. Since
flag is true on the first pass, it forces the execution of
loop-statement . On subsequent passes, it is 0 or false, so the normal
end testing takes over.
Table 6-8. FOR Statement Examples
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| | |
| SPL | HP C/XL Equivalent |
| | |
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| | |
| | |
| FOR I:=ABC STEP 1 UNTIL 99 | for ( I = ABC ; I <= 99 ; I++ ) |
| DO A(I):=B(I)-X; | A[I] = B[I]-X; |
| | |
| | |
| FOR * I:=ABC STEP -1 UNTIL 0 | for ( ONCE = 1 , I = ABC ; |
| DO A(I):=B(I)-X; | ONCE || I >= 0 ; |
| | ONCE=0 , I-- ) |
| | A[I] = B[I]-X; |
| | |
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The SPL FOR * construct may also be easily emulated by an HP C/XL
do-while statement, as illustrated by the following statements:
I = ABC ;
do A[I] = B[I]-X ; while (--I >= 0);
IF Statement
Table 6-9. IF Statement
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| SPL | HP C/XL Equivalent |
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-
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| if-statement | if-statement :|
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|IF condition-clause THEN true-statement |if( condition-clause ) true-statement |
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| [ELSE false-statement ] | [else false-statement ]|
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|If condition-clause is true, true-statement | Same as SPL. |