1 #include <iostream> 2 using namespace std; 3  4 void to_lower(char* s) 5 { 6     while(*s!=‘\0‘) 7     { 8         if(*s>=‘A‘&&*s<=‘Z‘) 9             *s+=32;10         s++;11     }12 }13 14 char* strdup1(const char*s)15 {16     char *p=new char[];17     cout<<sizeof(s)<<endl;               //////////注意18     int i;19     for(i=0;s[i]!=‘\0‘;i++)20     {21         p[i]=s[i];22     }23     p[i]=‘\0‘;24     return p;25 }26 27 char* findx(const char*s,const char*x)28 {29     int i=0;30     while(*s!=‘\0‘)31     {32         while(*(s+i)==*(x+i)&&*(x+i)!=‘\0‘)33         {34             i++;35         }36         if(*(x+i)==‘\0‘)37             return (char*)s;38         else39             i=0;40         s++;41     }42     return NULL;43 }44 45 int main()46 {47     //char c[]="D";48     //cout<<sizeof(&c)<<endl;          //////////注意49     //char *p=strdup1(c);50 //    cout<<p<<endl;51     char c1[]="fgasdfghj";52     char c2[]="fgh";53     cout<<findx(c1,c2);54     while(1);55     return 0;56 57 }