C++中表示字符串长度

 1 #include <iostream>
 2 #include<string>
 3 #include<cstring>
 4 
 5 using namespace std;
 6 using std::string;
 7 
 8 int main()
 9 {
10     string ch = "panther";
11     int nSize = ch.size();
12     int nLength = ch.length();
13     cout << "nSize:" << nSize << endl;                //7
14     cout << "nLength:" << nLength << endl;            //7
15 
16 
17     char char1[] = "panther";
18     char *pChar = char1;
19 
20     int nStrlen = strlen(char1);
21     int nSizeofArr = sizeof(char1)/sizeof(char);//此处若char1定义时为[20],则此处nSizeof为20.
22     int nSizeofPtr = sizeof(pChar);    //这样写法则是指针所占内存
23     cout << "nStrlen:" << nStrlen << endl;            //7
24     cout << "nSizeofArr:" << nSizeofArr << endl;      //8
25     cout << "nSizeofPtr:" << nSizeofPtr << endl;      //4