Attachment 9956 Details for Bug 22525 – Generate a number of "hailstones"

Generate a number of "hailstones"

hailstones.c (text/plain), 782 bytes, created by Len Lawrence on 2018-02-06 13:08:00 CET

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Creator: Len Lawrence

Created: 2018-02-06 13:08:00 CET

Size: 782 bytes

patch

obsolete

#include <stdio.h>
#include <stdlib.h>

#define hailstone(number) (((number) % 2) == 0 ? (number) >> 1 : 3*(number) + 1)

int main ( int argc, char * argv[ ] )
{
    long count, m, n;

    if ( argc > 1 )
    {
        if ( (n = atol( argv[1] )) <= 0 )
        {
            printf( "Please supply a positive integer as a starting point\n" );
            return EXIT_FAILURE;
        }
    }
    else
    {
        printf( "Please supply a positive integer as a starting point\n" );
        return EXIT_FAILURE;
    }
    count = 0;
    if ( (m = n) == 1 )
    {
        ++count;
        n = hailstone( 1 );
    }
    while ( n != 1 )
    {
        ++count;
        n = hailstone( n );
    }
    printf( "%ld hailstones generated from %ld\n", count, m );
    return EXIT_SUCCESS;
}

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Attachments on bug 22525: 9956 | 9958