View Compilation Error

0_0_21498425_4095.cpp: In function 'int cmp(NODE, NODE)':
0_0_21498425_4095.cpp:14:26: error: 'strcmp' was not declared in this scope
     if(strcmp(x.ori,y.ori))  
                          ^
0_0_21498425_4095.cpp:16:24: error: 'strcmp' was not declared in this scope
     if(strcmp(x.lv,y.lv))  
                        ^
0_0_21498425_4095.cpp:27:32: error: 'strcmp' was not declared in this scope
     return strcmp(x.name,y.name)<0;  
                                ^
0_0_21498425_4095.cpp: In function 'int main()':
0_0_21498425_4095.cpp:40:29: error: 'strcpy' was not declared in this scope
         strcpy(s,girl[0].ori);  
                             ^
0_0_21498425_4095.cpp:50:38: error: 'strcmp' was not declared in this scope
             if(strcmp(s,girl[i+1].ori))  
                                      ^