View Compilation Error

0_0_32053608_25528.cpp: In function 'int main()':
0_0_32053608_25528.cpp:8:24: error: 'memset' was not declared in this scope
  memset(a, 0, sizeof(a));
                        ^
0_0_32053608_25528.cpp:12:21: error: 'strlen' was not declared in this scope
  int lena = strlen(a);
                     ^