View Compilation Error

0_0_23801030_10478.cpp: In function 'int main()':
0_0_23801030_10478.cpp:4:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&x,&y)!=EOF && ((x !=0)||(y != 0)))
                             ^
0_0_23801030_10478.cpp:4:32: error: 'EOF' was not declared in this scope
     while(scanf("%d%d",&x,&y)!=EOF && ((x !=0)||(y != 0)))
                                ^
0_0_23801030_10478.cpp:16:50: error: 'printf' was not declared in this scope
         printf("%d %d %d %d\n",left,down,right,up);
                                                  ^