what is meaning of this (!) and += operator

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Hello
I have confusing on two operators ! and +=

what is meaning of this operator ! in c programming

For Example
Pin = Low Pin is set to Low
if (!pin)

Does it mean check the condition if Pin is not low ?

what is meaning of this operator += in c programming

For example

int number = 1;
number += 60;
number +=62;
return number;
 

! operator is 'logical NOT'

if Pin is set to Low , then statement

if (!Pin)
test for final state to 'HIgh'

------
+= is a shorthand notation for addition and assignment.

number += 60; is same as
number=number+60;

(operator "+=" adds the right operand to the left operand and assign the result to the left operand.)
 
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