may

回復 1# 方浩葦
問:以下程式碼,會輸出什麼:

1. # include<string>
   
2. # include<iostream>
   
3. using namespace std;
   
4. 
   
5. int main()
   
6. {
   
7.     string str = "123456123456123456";
   
8.     cout<<str<<endl<<"0123456789ABCDEFGHJ"<<endl;//方便查看上面字符串的下标
   
9.    
   
10.     int pos = str.rfind("123");
    
11.     cout<<pos<<endl;;
    
12.     return 0;
    
13. }

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