View Compilation Error

0_0_35625762_32073.cpp: In function 'int main()':
0_0_35625762_32073.cpp:8:26: error: 'scanf' was not declared in this scope
  while(scanf("%d%d",&a,&b)!=EOF) {
                          ^
0_0_35625762_32073.cpp:8:29: error: 'EOF' was not declared in this scope
  while(scanf("%d%d",&a,&b)!=EOF) {
                             ^
0_0_35625762_32073.cpp:11:19: error: 'printf' was not declared in this scope
  printf("%d\n",sum);
                   ^