View Compilation Error

0_0_14681572_25550.cpp: In function 'int main()':
0_0_14681572_25550.cpp:9:21: error: 'scanf' was not declared in this scope
  while(scanf("%d",&n)!=EOF&&n>=0){
                     ^
0_0_14681572_25550.cpp:9:24: error: 'EOF' was not declared in this scope
  while(scanf("%d",&n)!=EOF&&n>=0){
                        ^
0_0_14681572_25550.cpp:29:27: error: 'printf' was not declared in this scope
   printf("%d %d\n",sum-i,i);
                           ^