<转>Find the Maximum of 2 numbers without using any if-else or any other comparison operator

Suppose 2 numbers are A and B .
Perform the operation A-B and extract the MSB .let it be k. Now if k =1 then A>B else B>A (2's complement)..
return (1-k)*A+k*B. This will alyways return the maximum of A&B

int a,b=0;
a = 7;
b = 9;
int diff = (unsigned int)(a-b) >> 31;
printf("\nDiff : %d\n",diff);
int sum = (1-diff)*a + (diff*b);
printf("\n Max of %d and %d is : %d\n",a,b,sum);