Thread: Whats Works?

you can always experiment

start with original file and compile it using gcc with -Wall

Fix errors in the original program and then add each of the lines proposed and check the errors and try to understand what is causing the errors

It's a silly question, designed to confuse rather than illuminate. It's also unsound, the answer to the last one depends which version of C you're using.

Originally Posted by ihackress

I have been given the following question and I am very confused about the possible answers. I don't know what the desired output is, what would work, or what the correct answer is. If someone is to help me, can you please explain as well, rather than simply giving the answer? Or even better, can you please explain, so I can get the answer myself? Thank you very much.

Which of the following is lines can be inserted into this program:

Code:

                        int f( int n ) { return n; }
                        void main( void ) {
                                    int i = 10;
                                    int j;
  < HERE >                        }
 
          a) f( i ) = j;
            b) f[ i ] = j;
            c) j = f( i );
            d) j = f[ i ];
            e) f( j, i );

This is the key:

Code:

 int f( int n ) { return n; }

My disclaimer: I've never seen a C function declared with a "{ return n;}", part on the end. It should be:

Code:

int f(int n);

IMO.

Choice 'a' is out because it has the return value and equal sign placed incorrectly.

f() (the function call syntax), uses parenthesis, not square brackets, so choices b and d are out of contention.

The function f() must have a single int parameter. Choice e doesn't have that, so it's out.

So pick any remaining choice. < grin >

basically they are asking, to call function "f" how would you do it

and because "f" returns a value, how to save that value as "j"

Code:

int f( int n ) 
 {
  return n;
 }
int main( void )
 {
  int i = 10;
  int j;
  //call function f here, sending i and saving return in j//
  return 0;
 }