View Compilation Error

0_0_37384989_25338.cpp: In function 'void toInt()':
0_0_37384989_25338.cpp:12:27: error: 'strlen' was not declared in this scope
     int len = strlen(aLine);
                           ^
0_0_37384989_25338.cpp:13:39: error: 'memset' was not declared in this scope
     memset(oneInput,0,sizeof(oneInput));
                                       ^
0_0_37384989_25338.cpp: In function 'int main()':
0_0_37384989_25338.cpp:36:33: error: 'memset' was not declared in this scope
         memset(res,0,sizeof(res));
                                 ^
0_0_37384989_25338.cpp:39:29: error: 'strlen' was not declared in this scope
             if (strlen(aLine) == 1 && aLine[0] == '0')
                             ^