In 64 bit compiler both int and log int are of 4 bytes.
If you are in windows go thorough the below link: http://msdn.microsoft.com/en-us/library/s3f49ktz%28v=vs.90%29.aspx
You may find some info in one other discussion: What is the bit size of long on 64-bit Windows?What is the bit size of long on 64-bit Windows?