Question

can any one please elaborate how to find largest of four numbers without using conditional operator.for 3 numbers i have done but for four numbers how to write different comparisons.

Answer 1

There is a standard way to compute min or max in 2’s complement arithmetics without using conditionals:

int max(int a, int b){
    unsigned diff = b - a;  // negative if a > b
    int sign = -(diff >> (sizeof(int) * CHAR_BIT - 1)); // -1 if a > b, 0 otherwise
    return (a & sign) | (b & ~sign);
}

it can be easily scaled.