IfArithmetic¶
The arithmetic IF statement branches to one of three specified statements,
depending on the value of an arithmetic expression.
Declaration¶
Syntax¶
IfArithmetic(expr test, int lt_label, int eq_label, int gt_label)
Arguments¶
test contains conditional expression to be evaluated.
lt_label contains
eq_label contains
gt_label contains
Return values¶
None.
Описание¶
IfArithmetic is the arithmetic if statement which branches to one of three
specified statements, depending on the value of an arithmetic expression.
Types¶
test can be arithmetic expression of type integer, real, double precision, or
quadruple precision.
The other three lables are labels of executable statements.
Examples¶
program ifarithmetic
integer :: i
i = 5
if (i == 5) print *, 'correct'
if (i == 6) print *, 'incorrect'
i = -2
40 i = i + 1
if (i) 50, 60, 70
50 print *, 'i < 0'
go to 40
60 print *, 'i == 0'
go to 40
70 print *, 'i > 0'
end program
ASR:
(TranslationUnit
(SymbolTable
1
{
if1:
(Program
(SymbolTable
2
{
i:
(Variable
2
i
Local
()
()
Default
(Integer 4 [])
Source
Public
Required
.false.
)
})
if1
[]
[(=
(Var 2 i)
(IntegerConstant 5 (Integer 4 []))
()
)
(If
(IntegerCompare
(Var 2 i)
Eq
(IntegerConstant 5 (Integer 4 []))
(Logical 4 [])
()
)
[(Print
()
[(StringConstant
"correct"
(Character 1 7 () [])
)]
()
()
)]
[]
)
(If
(IntegerCompare
(Var 2 i)
Eq
(IntegerConstant 6 (Integer 4 []))
(Logical 4 [])
()
)
[(Print
()
[(StringConstant
"incorrect"
(Character 1 9 () [])
)]
()
()
)]
[]
)
(=
(Var 2 i)
(IntegerUnaryMinus
(IntegerConstant 2 (Integer 4 []))
(Integer 4 [])
(IntegerConstant -2 (Integer 4 []))
)
()
)
(GoToTarget
40
40
)
(=
(Var 2 i)
(IntegerBinOp
(Var 2 i)
Add
(IntegerConstant 1 (Integer 4 []))
(Integer 4 [])
()
)
()
)
(If
(IntegerCompare
(Var 2 i)
Lt
(IntegerConstant 0 (Integer 4 []))
(Logical 4 [])
()
)
[(GoTo
50
50
)]
[(If
(IntegerCompare
(Var 2 i)
Gt
(IntegerConstant 0 (Integer 4 []))
(Logical 4 [])
()
)
[(GoTo
70
70
)]
[(GoTo
60
60
)]
)]
)
(GoToTarget
50
50
)
(Print
()
[(StringConstant
"i < 0"
(Character 1 5 () [])
)]
()
()
)
(GoTo
40
40
)
(GoToTarget
60
60
)
(Print
()
[(StringConstant
"i == 0"
(Character 1 6 () [])
)]
()
()
)
(GoTo
40
40
)
(GoToTarget
70
70
)
(Print
()
[(StringConstant
"i > 0"
(Character 1 5 () [])
)]
()
()
)]
)
})
[]
)