View Compilation Error

0_0_27525249_29438.cpp: In function 'int main()':
0_0_27525249_29438.cpp:4:34: error: 'scanf' was not declared in this scope
     while(scanf("%c%c%c",&a,&b,&c) != EOF)
                                  ^
0_0_27525249_29438.cpp:4:39: error: 'EOF' was not declared in this scope
     while(scanf("%c%c%c",&a,&b,&c) != EOF)
                                       ^
0_0_27525249_29438.cpp:11:35: error: 'printf' was not declared in this scope
          printf("%c %c %c\n",x,y,z);
                                   ^