View Compilation Error

0_0_27291163_14321.cpp: In function 'int main()':
0_0_27291163_14321.cpp:10:26: error: 'strlen' was not declared in this scope
         int lena=strlen(a);
                          ^
0_0_27291163_14321.cpp: In function 'bool Same(int, int, char*, char*)':
0_0_27291163_14321.cpp:34:18: error: 'strcmp' was not declared in this scope
     if(strcmp(c,b)==0)
                  ^