Problems shifting an int 32 times. Gcc 3.4.5

[Juan Reina]

Hello:

I have a problem using the shift operator, maybe a bug (ok, a bug or i'm wrong about shift operator)

System: i386-redhat-linux
Version: Gcc 3.4.5
Case:
 In the next snipplet:
unsigned int getMask(int n){
unsigned int mask = 0;
a = ~(~(a)<<n);
}

In case of n<32, the function works correct but if n=32, the value of a is 0 (when should be 0xFFFF).

Thanks in advance
Juan

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