View Compilation Error

0_0_16498043_25229.cpp: In function 'int main()':
0_0_16498043_25229.cpp:4:36: error: 'scanf' was not declared in this scope
     while(scanf("%c %c %c",&a,&b,&c)!=EOF)
                                    ^
0_0_16498043_25229.cpp:4:39: error: 'EOF' was not declared in this scope
     while(scanf("%c %c %c",&a,&b,&c)!=EOF)
                                       ^
0_0_16498043_25229.cpp:6:17: error: 'getchar' was not declared in this scope
         getchar();
                 ^
0_0_16498043_25229.cpp:27:29: error: 'printf' was not declared in this scope
    printf("%c %c %c\n",a,b,c);
                             ^