C++字符串操作库函数

 #include <bits/stdc++.h>

 using namespace std;

 int main()

 {

 char s1[]="";

 char s2[]="abcdefg";

 char s3[]="ABCDE";

 strncat(s1,s2,);

 cout<<s1<<endl;///输出12345abc

 strncpy(s1,s3,);

 cout<<s1<<endl;///输出ABC45abc

 strncpy(s2,s3,);

 cout<<s2<<endl;///输出ABCDE

 cout<<strncmp(s1,s3,)<<endl;///输出0

 char *p=strchr(s1,'B');

 if(p)

 cout<<p-s1<<","<<*p<<endl;///输出1,B

 else

 cout<<"Not Found"<<endl;

 p=strstr(s1,"45a");

 if(p)

 cout<<p-s1<<","<<p<<endl;///输出3,45abc

 else

 cout<<"Not Found"<<endl;

 cout<<"strtok usage demo:"<<endl;

 char str[]="- This,a sample string,ok.";

 p=strtok(str," ,.-");

 while(p!=NULL)

 {

 cout<<p<<endl;

 ////////////输出

 /*

 This

 a

 sample

 string

 ok

 */

 p=strtok(NULL," ,.-");

 }

 return ;

 }