View Compilation Error

0_0_32080979_6019.cpp: In function 'int main()':
0_0_32080979_6019.cpp:5:39: error: 'scanf' was not declared in this scope
     while(scanf("%c%c%c%c",&a,&b,&c,&d) != EOF)
                                       ^
0_0_32080979_6019.cpp:5:44: error: 'EOF' was not declared in this scope
     while(scanf("%c%c%c%c",&a,&b,&c,&d) != EOF)
                                            ^
0_0_32080979_6019.cpp:12:35: error: 'printf' was not declared in this scope
          printf("%c %c %c\n",x,y,z);
                                   ^