can anyone explain this code?

Question

int a=3,b=4;
a+=(-a==1?-3:4);
cout<<a;

what is the answer and explain it details. thanks 😀

Answer 1

Answer is 7

a+=((-a==1)?-3:4);
a=a+((-a==1)?-3:4);
//assigning a value
a=3+((-3==1)?-3:4); // -3 is not equal to 1 so its false
a=3+4;
a=7

Answer 2

This code prints out 7.

On the second line: if -a is equal to 1, then the statement in brackets returns -3, if not it returns 4.
Then the return value of the brackets statement is added to the original value of a.

In a nutshell: a is equal to 3, -a is equal to -3, which is different from 1. So the 2nd line gives a = a + 4 = 3 + 4 = 7.

Answer 3

thanks a lot! really helpful