Explain what does this mean

Question

total+=number;
what is this sign +=

Answer 1

@Stephen

total+=number;

OR

total=total+number;

Answer 2

x+=y is x = x + y
it works with all arithmetic operations (x*=y is x = x * y).

Answer 3

This is known as shorthand notation
shorthand what is means
a+=b a = a + b
a-=b a = a - b
a/=b a = a / b
a*=b a = a * b
a%=b a = a % b

Answer 4

It means total = total + number

Answer 5

it's the 'Add assignment operator'

and I believe they covered above what it does lol