36 下列 C++程式的輸出應為何？ #include ＜stdio.h＞#include ＜string＞using namespace std;int unknown(string s){int count=0;for (int i=0; i＜s.length( ); i++){if (s[i] == 'e')count ++;}return(count);}void main () {int output = unknown("abeeee");printf("%d", output);} 
(A)0
(B)3
(C) 4
(D) 6