0 thru 31=32

>There're 32 bits not 31. To be presize, the max value stored in 32 bits is 2^32-1. See UINT_MAX at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/class_34.asp.
>
>>
>>2^0=1
>>2^1=2
>>2^2=4
>>2^3=8
>>2^4=16
>>2^5=32
>>2^6=64
>>2^7=128
>>2^8=256
>>2^9=512
>>2^10=1024
>>2^11=2048
>>2^12=4096
>>2^13=8192
>>2^14=16384
>>2^15=32768
>>2^16=65536
>>2^17=131072
>>2^18=262144
>>2^19=524288
>>2^20=1048576
>>2^21=2097152
>>2^22=4194304
>>2^23=8388608
>>2^24=16777216
>>2^25=33554432
>>2^26=67108864
>>2^27=134217728
>>2^28=268435456
>>2^29=536870912
>>2^30=1073741824
>>2^31=2147483648
>>__________
>>3,221,225,472 (Total of all 1's)
>>