View Compilation Error

0_0_34762353_11710.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
  #include
          ^
0_0_34762353_11710.cpp: In function 'int main()':
0_0_34762353_11710.cpp:7:38: error: 'scanf' was not declared in this scope
             while(scanf("%[^\n]%*c",a)!=EOF)
                                      ^
0_0_34762353_11710.cpp:7:41: error: 'EOF' was not declared in this scope
             while(scanf("%[^\n]%*c",a)!=EOF)
                                         ^
0_0_34762353_11710.cpp:26:50: error: 'printf' was not declared in this scope
                             printf("%.2f\n",sum/i);
                                                  ^
0_0_34762353_11710.cpp:28:69: error: 'printf' was not declared in this scope
                             printf("Unknown letter grade in input\n");
                                                                     ^