Rotating a linear number - How?

I am currently writing code to construct a game for android devices, however part of my code requires rotating numbers to create random choices, missions, stars etc. However I am fairly new to coding and although I understand quite a bit of it, this has me completely stumped.

I am writing this in Javascript/Unityscript

Currently my code is as follows, at least where I am stuck that is...

 var coordx_2;
 var coordy_2;
 var sysNum;
 var dest;
 var strcpy;
 var strcat;
 
 
     coordx_2 += sysNum;
     coordy_2 += coordx_2;
     coordx_2 = rotate_some(coordx_2, 3);
     coordx_2 += coordy_2;
     coordy_2 = rotate_some(coordy_2, 5);
     coordy_2 += coordx_2;
     coordy_2 = rotate_some(coordy_2, 4);
     coordx_2 = rotate_some(coordx_2, sysNum);
     coordx_2 += coordy_2;
     
     strcpy (dest, namePart[(coordx_2>>2) & 31]);
     coordx = (coordx_2) 5; //This is the part that needs rotating, also says that ';' is expected
     strcat (dest, namePart[(coordx_2>>2) & 31]);
     coordx = (coordx_2) 5; //This is the part that needs rotating, also says that ';' is expected
     strcat (dest, namePart[(coordx_2>>2) &31]);
     dest[0] ^= 0x20;

I should also mention that I do not want to use the Rand keyword as that will create too many random elements, this is meant to be a controlled reaction, Think of it as rotating an object by so many degrees, but each time you do it, it changes shape slightly.