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Explain the given C program.

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<code>#include <stdio.h>
        int main()
        {
            unsigned int b = 20;
            b = ~b;
            printf("%d\n", b);
        }</code>
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unsigned int b=0000000000010100 (assuming int = 2 bytes)

b=~b, therefore b=1111111111101011

now %d specifier does not know anything about signed or unsigned, it just assume that the given number is in signed 2's complement form..

and hence value returned will be -21...
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