View Compilation Error

0_0_35110002_25019.cpp: In function 'int main()':
0_0_35110002_25019.cpp:229:33: error: 'memset' was not declared in this scope
         memset(ha, 0, sizeof(ha));
                                 ^
0_0_35110002_25019.cpp:238:32: error: 'strcmp' was not declared in this scope
             if( strcmp(str, "H") == 0 ) {
                                ^