Thread: another exam question

Looks like a fair question to me.

OK, you seem to be on a hunt for questions.... here's one for you.

Here's some code that works.... or does it?!

Code:

/*
 * sample1.c
 * This program adds up the values in the array,
 * and prints the results to the screen
 */

#include <stdio.h>

int Adder(int a[])
{
  int i;
  int myTotal;
  for (i = 0; i < sizeof(a); i++)
    myTotal += a[i];
  return myTotal;
}

int main(void)
{
  int myarray[6] = {5, 1, 3, 2, 4};
  int Total;
  
  Total = Adder(myarray);
  printf ("The total of the %d elements is %d\n", sizeof(myarray), Total);
  
  return(0);
}

As you've guessed/worked out, it doesn't do what it's supposed to. Explain the problems and suggest some corrections.

How about this?

In C99, what will the following code print?

Code:

#include<stdio.h>

int main(void)
{
    for(unsigned char i=0;i<=255;printf("%i\n",i++));
}

a) The program will print characters from the character set from value 0 through 255 each on a new line.
b) The program will print numbers from 0 through 255 each on a new line.
c) The program will print the numbers 0 through 255 each on a new line and repeat forever.
d) Both b and c are possible results.
e) It is not a valid for loop because of where i is declared.
f) It is not a valid for loop because of where the call to printf occurs.
g) It is not a valid for loop because it has no body.
h) The program will not compile because main doesn't return anything.

As an instructor as well I have posted questions in the past on this board. The average question is a fair question. I teach C as well to beginners and intermediate students.