How its result 17? can anyone explain

Question

What is the output of this code?
int result = 0;
for (int i = 0; i < 5; i++) {
if (i == 3) {
result += 10;
} else {
result += i;
}
}
System.out.println(result);

//Output : 17

actually i don't understand " result+=" this section;

Answer 1

+= its an operator that add the current value + the new one.

result = result + i;
or
result+=i;

both codes do the same.