Answer 1

+ Addition operator

It is used to add two operands together.

2 + 7 == 9
5 + 't' == '5t'

++ Increment operators

When it comes before the operand, it increments the operand by 1 immediately.
a = 9
++a == 10

When it comes after the opersnd, it increments the operand after the statement's execution. (Post-increment)

a = 9
a++ == 9
a == 10