View Compilation Error

0_0_37332418_8800.cpp: In function 'int main()':
0_0_37332418_8800.cpp:5:33: error: 'scanf' was not declared in this scope
     while (scanf("%d %d", &n, &m) != EOF)
                                 ^
0_0_37332418_8800.cpp:5:38: error: 'EOF' was not declared in this scope
     while (scanf("%d %d", &n, &m) != EOF)
                                      ^
0_0_37332418_8800.cpp:19:31: error: 'printf' was not declared in this scope
         printf("%d %d\n", x, y);
                               ^