Syntax help
1. If-Else
When ever you want to perform a set of operations based on a condition If-Else is used.
Prime Plus Language (P+)
if expression then
// code for 'expression' is true
else
// code for 'expression' is false
endif;
if expression {
// code for 'expression' is true
}
HP Prime Programming Language (PPL)
IF expression THEN
// code for 'expression' is true
ELSE
// code for 'expression' is false
END;
IF expression THEN
// code for 'expression' is true
END;
2. Switch-Case
Switch-case is an alternative to If-Else-If ladder.
Prime Plus Language (P+)
switch expression
case condition1
// statements
end;
case condition2
// statements
end;
.
.
.
case conditionN :
// statements
end;
default
// default statements
end;
HP Prime Programming Language (PPL)
CASE
IF expression1 THEN
// statements
END;
IF expression2 THEN
// statements
END;
.
.
.
IF expressionN THEN
// statements
END;
DEFAULT // optional
// statements
END;
3. For-Next
For-next loop is used to iterate a set of statements based on a condition.
Prime Plus Language (P+)
for a = 0 ... 9 {
// code
}
for a = 9 down ... 0 step b {
// code
}
for b from 0 ... 9 step 1 do
// code
next;
for c from 9 down ... 0 step 2 do
// code
next;
HP Prime Programming Language (PPL)
FOR a FROM 0 TO 9 DO
// code
END;
FOR a FROM 9 DOWNTO 0 STEP b DO
// code
END;
FOR b FROM 0 TO 9 STEP 1 DO
// code
END;
FOR c FROM 9 DOWNTO 0 STEP 2 DO
// code
END;
4. While-Do
While-do is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
note:
Also valid PPL code.
Prime Plus Language (P+)
while condition do
// code
end;
while condition {
// code
}
HP Prime Programming Language (PPL)
WHILE condition DO
// code
END;
5. Repeat-Until
Repeat-until is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
note:
Also valid PPL code.
Prime Plus Language (P+)
repeat
// code
until condition
HP Prime Programming Language (PPL)
REPEAT
// code
UNTIL condition
6. Function
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.
Prime Plus Language (P+)
var var1, var2; // global variables
var3; // var is optional for global variables
export MAINPRG()
@begin
// code
alias NUM_ZERO 0
return NUM_ZERO;
@end
embed include.pp
SUBROUTINE()
@begin
var var4; // local variable only : SUBROUTINE()
var4 = var3+var2-var1;
@end
include.pp
SUBROUTINE_FILE()
@begin
return !NUM_ZERO;
@end
HP Prime Programming Language (PPL)
LOCAL var1, var2; // global variables
var3; // LOCAL is optional for global variables
EXPORT MAINPRG()
BEGIN
// code
return 0;
END;
SUBROUTINE_FILE()
BEGIN
return NOT 0;
END;
SUBROUTINE()
BEGIN
LOCAL var4; // local variable only : SUBROUTINE()
var4 := var3+var2-var1;
END;
7. Double-Identity
Now, variables with names from a-z have the capability to be associated with an alternative identity, allowing for a more meaningful name while still maintaining a single-character name. This approach is advantageous as it requires only two bytes of storage in the hpprgm file format.
Prime Plus Language (P+)
SUBROUTINE(a:alpha)
@begin
var i:index = 1;
var ?:auto_variable_name = 2;
PRINT([alpha]);
PRINT([index]);
PRINT([auto_variable_name]);
@end // All Double Identities Purged
HP Prime Programming Language (PPL)
SUBROUTINE(a)
BEGIN
LOCAL i := 1;
LOCAL b := 2;
PRINT(a);
PRINT(i);
PRINT(b);
END;