What's the output of this code? Why?

Question

int main() {
int a,b;
a=10;
b=++a + ++a + ++a;
cout<<b;
return 0;
}

Answer 1

The output is 37🤔🤔🤔🤔
For multiple pre & post increments/decrements standard is not define, so it depends on compiler...
the 1st two variable when incremented both gets the value of 2nd variable ....
then the increment is done normally...
here :-
b=(++a + ++a) + ++a
b=(++11 + ++11) + ++12
= 12+12+13
=37
for eg:-
b= ++a + ++a + ++a + ++a;
b=(++11 + ++11) + ++12 + ++13
= 12+12+13+14
= 51

Answer 2

b=++10 + ++11 + ++12
= 11+12+13
=36

& a=13
//edit : in java

Answer 3

c,c++ is confusing , java is clear language
//after seeing DT's answer 😃