给你两个字符串str1，str2，找出str2在str1中的位置

 1 #include <iostream>
 2 #include <cstdio>
 3 
 4 using namespace std;
 5 
 6 char *strstring(char *ParentString,char *SubString)
 7 {
 8     char *pSubString,*pParentString;
 9     for(char *pTmp = ParentString; *pTmp !=‘\0‘ ; pTmp++)
10     {
11         pSubString = SubString;
12         pParentString = pTmp;
13         while(*pSubString != ‘\0‘ && *pSubString == *pParentString)
14         {
15             pSubString++;
16             pParentString++;
17         }
18         if(*pSubString == ‘\0‘)
19         {
20             return pTmp;
21         }
22     }
23     return NULL;
24 }
25 
26 int main()
27 {
28     cout << "Hello world!" << endl;
29     char *ParentString = "I love TrendMicro!";
30     char *SubString = "Trend";
31     printf("%s\n",strstring(ParentString,SubString));
32     return 0;
33 }