What number would be shown on the screen after the following statements of C are

What number would be shown on the screen after the following statements of C are executed?

char ch;
  int i;
  ch = 'G';
  i = ch-'A';
 printf("%d", i);

2) Binary number uses only ________ digits.

3) A translator which reads an entire program written in high-level and convert it into machine language code is:

4) Which one of the following is not a valid identifier?

5) Which of the following is not one of the processes that a high-level language program must go through before it is ready to be executed?