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Like the following code, else will report an error, "variable declaration not allowed here", because Java believes that the sentence int sum = (b_len-) - '0' is two sentences, int sum and sum = (b_len-) - '0'

while (a_len >= 0 || b_len >= 0) {
	if (a_len >= 0) {
		int sum = a.charAt(a_len--) - '0';
	}
	else
		int sum = b.charAt(b_len--) - '0';
}