View Compilation Error

0_0_20727852_22767.cpp: In function 'int main()':
0_0_20727852_22767.cpp:2:30: error: 'scanf' was not declared in this scope
 #define RI(x) scanf("%d",&(x))
                              ^
0_0_20727852_22767.cpp:11:2: note: in expansion of macro 'RI'
  RI(t);
  ^
0_0_20727852_22767.cpp:3:30: error: 'printf' was not declared in this scope
 #define PI(x) printf("%d",(x))
                              ^
0_0_20727852_22767.cpp:17:3: note: in expansion of macro 'PI'
   PI(i-1);
   ^
0_0_20727852_22767.cpp:18:15: error: 'putchar' was not declared in this scope
   putchar('\n');
               ^