View Compilation Error

0_0_38404014_30945.cpp: In function 'int main()':
0_0_38404014_30945.cpp:4:29: error: 'scanf' was not declared in this scope
  while (scanf("%d%d", &n, &m) != EOF) {
                             ^
0_0_38404014_30945.cpp:4:34: error: 'EOF' was not declared in this scope
  while (scanf("%d%d", &n, &m) != EOF) {
                                  ^
0_0_38404014_30945.cpp:18:26: error: 'printf' was not declared in this scope
      printf("%c", a[i][j]);
                          ^
0_0_38404014_30945.cpp:20:16: error: 'printf' was not declared in this scope
      printf(" ");
                ^
0_0_38404014_30945.cpp:23:18: error: 'printf' was not declared in this scope
     printf("\n\n");
                  ^