Listing All Permutations Of A Set

hello every one:
i want to write a program in which a set is entered.two numbers of the set is also entered.it will print all the combinations and permutations on the out put screen.
E-G
if i have a set {1,2,3,4,5}
if i select permutation for two numbers than it will print
e-g
1 2
2 1
1 3
3 1
1 4
4 1
1 5
5 1
2 3
3 2
2 4.........
i want the code of this program in simple C language..
THANKS TO ALL OF U.

re: Listing All Permutations Of A Set

Why did you ask your question in a Java Forum then?

kind regards,

Jos