View Compilation Error

0_0_26287266_13642.cpp: In function 'int main()':
0_0_26287266_13642.cpp:4:20: error: 'scanf' was not declared in this scope
 while(scanf("%d",&n)!=EOF&&n!=0)
                    ^
0_0_26287266_13642.cpp:4:23: error: 'EOF' was not declared in this scope
 while(scanf("%d",&n)!=EOF&&n!=0)
                       ^
0_0_26287266_13642.cpp:10:17: error: 'printf' was not declared in this scope
  printf("%d\n",b);
                 ^