what does the following function do int fn unsigned x count..., Programming with C, General Programming

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Question:What does the following function do?int fn(unsigned int x)
{
        int count = 0;
        for(; x!=0; x&=(x-1))
                count++;
        return count;
}

A Returns the minimum number of bits required to represent the number x 
B Returns the number of zero bits present in the number x 
C Returns the number of 1 bits(bits having one) in the number x 
D Returns the square root of the number 
E None

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Question:What does the following function do?int fn(unsigned int x) { int count = 0; for(; x!=0; x&=(x-1)) count++; return count; }

A Returns the minimum number of bits required to represent the number x

B Returns the number of zero bits present in the number x

C Returns the number of 1 bits(bits having one) in the number x

D Returns the square root of the number

E None

C

Question:What does the following function do?
int fn(unsigned int x) { int count = 0; for(; x!=0; x&=(x-1)) count++; return count; }