error: ‘n’ was not declared in this scope

Question

I wrote a function to find the sum of divisors for a number n.

int divisor_sum(long n) {
    long sum = 0;
    for (int a=1, a<=n, a++) {
        if n % a == 0 {
            sum = sum + a;
        }
    }
    return sum;
}

Unfortunately, the program (which includes a main function skeleton) won't compile because it says that "'n' was not declared in this scope." I've tried declaring n as a long before and after the function definition statement to no avail. How do I fix this? Thanks

`if n % a == 0` --- > `if (n % a == 0)`. An if statement condition must be parenthesized in C++ — StoryTeller - Unslander Monica, Feb 05 '18 at 06:32
`for (int a=1, a<=n, a++)` => `for (int a=1; a<=n; a++)` with semicolons. — O'Neil, Feb 05 '18 at 06:39
[The Definitive C++ Book Guide and List](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list). — molbdnilo, Feb 05 '18 at 08:20

score 0 · Answer 1 · answered Feb 05 '18 at 06:50

0

Like StoryTeller and O'Neil told you in the comments, you need to replace this

for (int a=1, a<=n, a++)

with

for (int a = 1; a <= n; a++)

and this

if n % a == 0

with

if (n % a == 0)

answered Feb 05 '18 at 06:50

Sid S

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error: ‘n’ was not declared in this scope

1 Answers1