View Compilation Error

0_0_33768449_15480.cpp: In function 'int main()':
0_0_33768449_15480.cpp:5:17: error: 'n' was not declared in this scope
     scanf("%d",&n);
                 ^
0_0_33768449_15480.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&n);
                  ^
0_0_33768449_15480.cpp:9:17: error: 'getchar' was not declared in this scope
         getchar();
                 ^
0_0_33768449_15480.cpp:11:36: error: 'printf' was not declared in this scope
             printf("%d\n",b+a-'A'+1);
                                    ^
0_0_33768449_15480.cpp:14:38: error: 'printf' was not declared in this scope
             printf("%d\n",b-(a-'A'+1));
                                      ^