PMult

Small program to explore ranges of numbers to find the number with the highest multiplicative persistence. Can also be used to check individual numbers

Compilation

make

Usage

pmult

Single-threaded version.

Checking a range:

./pmult <min> <max>

or to check a single number:

./pmult <number>

threadpmult

Multi-threaded version (using pthreads)

Checking a range:

./threadpmult <min> <max> <threads>

or to check a single number:

./threadpmult <number>

forkpmult

Multi-process version (using fork)

Checking a range:

./forkpmult <min> <max> <threads>

or checking a single number:

./forkpmult <number>

Example Usage

Checking all number between 11 and 10000 with 5 threads:

$ ./forkpmult 11 10000 5

Min: 11 Max: 2008 PID: 12048
Min: 2008 Max: 4005 PID: 12049
Min: 4005 Max: 6002 PID: 12050
Min: 6002 Max: 7999 PID: 12051
Min: 7999 Max: 10000 PID: 12052
Process 12048 complete!
Process 12050 complete!
Process 12049 complete!
Process 12052 complete!
Process 12051 complete!

Best number: 6788
Levels: 6