Could someone provide explaination regarding the working of increment and decrement operations esp. explain the working of below

Question

int a=1;
cout<<++a+a++<<endl; //Output is 5

a=1;
cout<<(a++)+(++a)<<endl; //Output is 4

a=1;
int b=++a + ++a + ++a;
cout<<b; //Output is 10

*Please note that the outputs are as received from Dev C++ Compiler

Thank You.

Answer 1

int a=1;

cout<< ++a + a++ <<endl //Output is 5

++a a = 2

2 + a++
2 + 2 ++
2 + 2 + 1
5

a=1;

cout<<(a++)+(++a)<<endl; //Output is 4

(a++) = (1)++ |
(a++) = 1 but after this variable is now 2 here \/

1 + (++a) this one has the increment during so ++a = 3

1 + 3 = 4

Try to understand the third one now I think you got it!