View Compilation Error

0_0_32864157_3171.cpp: In function 'bool fun(char*)':
0_0_32864157_3171.cpp:10:27: error: 'strlen' was not declared in this scope
     for(int i=0;i<strlen(s)/2;i++)
                           ^
0_0_32864157_3171.cpp: In function 'int main()':
0_0_32864157_3171.cpp:35:24: error: 'strcpy' was not declared in this scope
         strcpy(p[k++],s);
                        ^
0_0_32864157_3171.cpp:39:37: error: 'strlen' was not declared in this scope
             for (int i=0; i<strlen(s)/2; i++)
                                     ^