
Sorting Algorithm

This is a sorting algorithm.   It may be applied to a set of data in order to sort it.    
For comparing various sorts, see compare sorts.  
For other sorting algorithms,   see sorting algorithms,   or:

O(n logn) sorts
Heap sort |
Merge sort |
Patience sort |
Quick sort
O(n log2n) sorts
Shell Sort
O(n2) sorts
Bubble sort |
Cocktail sort |
Cocktail sort with shifting bounds |
Comb sort |
Cycle sort |
Gnome sort |
Insertion sort |
Selection sort |
Strand sort
other sorts
Bead sort |
Bogo sort |
Common sorted list |
Composite structures sort |
Custom comparator sort |
Counting sort |
Disjoint sublist sort |
External sort |
Jort sort |
Lexicographical sort |
Natural sorting |
Order by pair comparisons |
Order disjoint list items |
Order two numerical lists |
Object identifier (OID) sort |
Pancake sort |
Quickselect |
Permutation sort |
Radix sort |
Ranking methods |
Remove duplicate elements |
Sleep sort |
Stooge sort |
[Sort letters of a string] |
Three variable sort |
Topological sort |
Tree sort




Task

Sort an integer array with the   radix sort algorithm.

The primary purpose is to complete the characterization of sort algorithms task.




PROC radixsort = (REF []INT array) VOID:
(
    [UPB array]INT zero;  
    [UPB array]INT one;   
    BITS mask := 16r01;  
    INT zero_index  := 0, 
        one_index   := 0,
        array_index := 1; 
 
    WHILE ABS(mask) > 0 DO 
        WHILE array_index <= UPB array DO 
            IF (BIN(array[array_index]) AND mask) = 16r0 THEN 
                zero_index +:= 1;
                zero[zero_index] := array[array_index]
            ELSE            
                one_index +:= 1;
                one[one_index] := array[array_index]
            FI;
            array_index +:= 1 
        OD;
 
        array_index := 1; 
        FOR i FROM 1 TO zero_index DO 
            array[array_index] := zero[i];
            array_index +:= 1
        OD;
 
        FOR i FROM 1 TO one_index DO 
            array[array_index] := one[i];
            array_index +:=1
        OD;
 
        array_index := 1;
        zero_index := one_index := 0;
        mask := mask SHL 1 
    OD
);
 
main:
(
    [10]INT a;
    FOR i FROM 1 TO UPB a DO
        a[i] := ROUND(random*1000)
    OD;
 
    print(("Before:", a));
    print((newline, newline));
    radixsort(a);
    print(("After: ", a))
)