Can someone explain postfix and prefix to me. Thanks

Question

X++, ++X

Answer 1

https://www.sololearn.com/Discuss/407846/?ref=app

Answer 2

https://www.sololearn.com/discuss/489143/?ref=app

Answer 3

a=1;
b= ++a; //a increments BEFORE assign its value
// b=2, a=2

a=1;
b= a++; //a increments AFTER assign its value
// b=1, a=2