ISRO 2013

Question

What is the difference when we say a zero flag has value 1' and when a zero flag has value 0 after addition of two numbers given in 2's complement?

Answer 1

if (zero flag == 1)
    //result is zero
else if(zero flag== 0)
    //RESULT is NON ZERO.

Comments

zero flag value is coming zero but correct answer has value for zero flag as 1'

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then give the question..