For my programming languages course, I'm trying to write some code snippets in languages that use pass by name or pass by value-result, preferably by default, but any language that even supports either of those would be fine. However, I haven't been able to find a single language that supports either of them. Does anyone know of a language that uses pass by value-result or pass by name? Preferably an imperative language.
+1
A:
I think C Macros are Pass-by-name (not the C language itself of course). I don't know of any pass-by-value-result languages I'm afraid (to be honest I had to do a web search to find out what it means!).
Steve Haigh
2009-04-05 00:57:42
I'm not sure C macros "count" for what I'm trying to do, but that's an interesting thought, so thanks for that.
dancavallaro
2009-04-05 02:44:28
+4
A:
The wikipedia article on evaluation strategy suggests that call-by-value-result is supported by fortran. Call-by-name is supported by algol 68.
1800 INFORMATION
2009-04-05 01:14:36
**Algol 60** has call-by-value and call-by-name; **Algol 68** has call-by-value and call-by-reference, and the programmer can manually adopt a call-by-copy-restore methodology. Call-by-sharing looks a bit like call-by-reference (in the form of "proceduring"), but I'm not sure if they are actually the same in Algol68. The first version of Algol68 had call-by-need, but it was removed in Rev1;
NevilleDNZ
2010-05-12 12:47:04
+1
A:
if you pass a variable to a fortran function and you modify it there, you also modify it in the calling program:
psuedocode:
int j = 1
print j
addOne(j)
print j
would output:
1
2
masher
2009-04-05 01:27:32
I was always amused by the (really) old versions of Fortran that would let you call addOne(1) and modify the value of the constant 1.
Greg Hewgill
2009-05-08 03:46:20
A:
Both Java and C are pass-by-value language.
C is clearly a pass by value language.
Java is always been told "primitives are passed by value, objects are passed by reference". But since java object is a reference at anytime, so it is actually a reference value.
Java Language specification tells this: http://java.sun.com/docs/books/jls/second_edition/html/classes.doc.html#37472
arsane
2009-04-05 01:51:44
A:
Algol supports pass-by-name as you can find some explanation here
I was told that Ada supports pass-by-value/result but haven't tried out yet.
phamnamlong
2010-04-07 10:34:37
A:
need difference between pass by value result and pass by reference......
Rakesh
2010-04-12 16:41:51