View Compilation Error

0_0_15577467_22416.cpp: In member function 'void Matrix::init()':
0_0_15577467_22416.cpp:10:29: error: 'memset' was not declared in this scope
         memset(a,0,sizeof(a));
                             ^
0_0_15577467_22416.cpp: In member function 'void Matrix::print()':
0_0_15577467_22416.cpp:15:37: error: 'printf' was not declared in this scope
                 printf("%d ",a[i][j]);
                                     ^
0_0_15577467_22416.cpp:16:24: error: 'printf' was not declared in this scope
             printf("\n");
                        ^