View Compilation Error

0_0_21265355_26093.cpp: In function 'void decipher()':
0_0_21265355_26093.cpp:12:36: error: 'strlen' was not declared in this scope
     for (int i = 0;i < strlen(aLine);i ++)
                                    ^
0_0_21265355_26093.cpp: In function 'int main()':
0_0_21265355_26093.cpp:26:38: error: 'strcmp' was not declared in this scope
         if (strcmp(aLine,"ENDOFINPUT") == 0)
                                      ^
0_0_21265355_26093.cpp:31:35: error: 'strcmp' was not declared in this scope
             if (strcmp(aLine,"END") == 0)
                                   ^