1 #include <iostream>
 2 #include <cstring>
 3 using namespace std;
 4 int main(){
 5     char str1[50]="He is my best friend";
 6     char* str2="He is not my best friend";
 7     cout<<"The strings that you typed is: "<<endl
 8         <<str1<<endl<<str2<<endl;
 9     //输出两个字串的长度
10     cout<<"Their length is "<<strlen(str1)<<" and "<<strlen(str2)<<endl;
11     //将str2合到str1里面
12     cout<<"After strcat str1 now is \n"<<strcat(str1,str2)<<endl;
13     //比较
14     cout<<"Comparing result is "<<strcmp(str1,str2)<<endl;
15     //将str2复制到str1里面
16     cout<<"After copy str1 now is \n"<<strcpy(str1,str2)<<endl;    
17     return 0;
18 }

1 #include <iostream>
2 #include <cstring>
3 using namespace std;
4 int main(){
5     char* str1="i earn money";
6     char* str2="aeiou ";
7     cout<<strspn(str1,str2);
8     return 0;
9 }

1 #include <iostream>
2 #include <cstring>
3 using namespace std;
4 int main(){
5     char* str1="How do you know that I love you";
6     char* str2="now";
7     cout<<strstr(str1,str2);
8     return 0;
9 }