View Compilation Error

0_0_25908231_26828.cpp: In function 'int main()':
0_0_25908231_26828.cpp:13:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF&&n!=0)
                     ^
0_0_25908231_26828.cpp:13:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF&&n!=0)
                        ^
0_0_25908231_26828.cpp:45:25: error: 'printf' was not declared in this scope
      printf("%c",p[i][j]);
                         ^
0_0_25908231_26828.cpp:52:16: error: 'printf' was not declared in this scope
     printf("\n");
                ^