View Compilation Error

0_0_24603277_28253.cpp: In function 'int main()':
0_0_24603277_28253.cpp:5:34: error: 'scanf' was not declared in this scope
     while(scanf("%c%c%c",&a,&b,&c)!=EOF)
                                  ^
0_0_24603277_28253.cpp:5:37: error: 'EOF' was not declared in this scope
     while(scanf("%c%c%c",&a,&b,&c)!=EOF)
                                     ^
0_0_24603277_28253.cpp:28:34: error: 'printf' was not declared in this scope
         printf("%c %c %c\n",a,b,c);
                                  ^