[ILUG-BOM] Check out this code

[Philip S Tellis]

#define BITCOUNT(x)     (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
#define  BX_(x)         ((x) - (((x)>>1)&0x77777777)             \
                             - (((x)>>2)&0x33333333)             \
                             - (((x)>>3)&0x11111111))

int main(){int a;printf("Enter an int: ");scanf("%d",&a);
return printf("No of 1 bits: %d\n",BITCOUNT(a));}

I found the #defines in one of my fortune files.  Added the mail function.
I haven't thought about it much, but can't figure out how it works so
well.

Philip


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Four thousand throats may be cut in one night by a running man.
                -- Klingon Soldier, "Day of the Dove", stardate unknown



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