What is the a++ for?

Question

int a = 42;
do {
cout << a << endl;
a++; // what is this for? The int will still be 42 but if you increase it by a++ why would it be 42? Wouldn’t it be 43??
} while(a < 5);

// Outputs 42

Answer 1

a++ is post increment and it first store the value then increment so value is store in a is 42 and then the loop is terminated so final value of a become 42
for more information
https://www.sololearn.com/Discuss/407846/?ref=app

Answer 2

Wait so after the a++ , can I do count << a; then would it return 43

Answer 3

Thanks man!