View Compilation Error

0_0_19813870_24458.cpp: In function 'int main()':
0_0_19813870_24458.cpp:10:22: error: 'scanf' was not declared in this scope
      scanf("%d%*c",&n);
                      ^
0_0_19813870_24458.cpp:12:17: error: 'putchar' was not declared in this scope
      putchar('6');
                 ^
0_0_19813870_24458.cpp:14:25: error: 'getchar' was not declared in this scope
           if((c=getchar())&&i>5)
                         ^
0_0_19813870_24458.cpp:18:15: error: expected '}' at end of input
       return 0;
               ^