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# Array

int arr[] = {11, 35, 62, 555, 989}; int sum = 0; for (int x = 0; x < 5; x++) { sum += arr[x]; } //output 1652 int arr[] = {11, 35, 62, 555, 989}; int sum = 0; for (int x = 0; x < 5; x++) { sum = arr[x]; sum++; } //output 990 why not 1656

2 Answers

+ 13

sum = value;
// assigns value to sum.
sum += value;
// adds value to sum.

+ 2

sum = arr[x];
This will set the sum equal to value at the index x. So sum is set to 11 then incremented:
sum++;
So now sum is equal to 12. Then sum is set to arr[ 1 ], which is 35 then incremented to 36. Eventually sum is set to 989 then incremented to 990.
I hope that makes sense. Happy coding!