merge two long numbers into one long number

[jatinch]

i am implementing blowfish algorithm..
i have a long number or a 64 bit no. say X
i have to divide this 64 bit block into two 32 bit blocks say xl and xr.

after doing some calculations i have to convert these two 32 bit blocks into 64 bit block again..
so how do i do this


pls help..

[anurag275125]

Convert two long numbers into String, then merge these two strings and then again convert this string into long number like this:

long l1=1234
long l2=5678

String s1=Long.toString(l1);
String s2=Long.toString(l2);

String s=s1+s2;

long l=Long.valueOf(s).LongValue();

[jatinch]

hii
thanks for the reply
but the problem i am facing now is that it is giving me number format exception for string s
i guess the string becomes too large to be stored in a long no.
what i want is
a long no. X ( 64 bit )
divide to two 32 bits xl and xr
and then merge xl and xr as 64 bit X again

[jkmyoung]

oh no!
With the string method, each number won't fill the 32 bit space they have been assigned.
ulong ul1 = 1234;
ulong ul2 = 5678;

ulong result = (ul1 << 32) | ul2;
Use a bit shift operator instead.