Section 16.4 Practice: Conditional Compilation

Check Your Understanding Check Your Understanding

1.

What is the output of the following code?

#define DEBUG 1
#include <stdio.h>
int main(void)
{
  int N, i, sum;
  i = 1;
  #if (DEBUG >=2)
    printf("It's a beautiful day! ");
  #elif (DEBUG >=1)
    printf("It's sunny! ");
  #elif (DEBUG >=0)
    printf("Not too bad! ");
  #else
    printf("Huh...! ");
  #endif
}

It’s sunny!
Correct
Huh...!
Not quite. Try again!
Not too bad!
Not quite. Try again!
It’s sunny! Not too bad!
Not quite. Try again!
It’s a beautiful day!
Not quite. Try again!
It’s a beautiful day! It’s sunny!
Not quite. Try again!
Not too bad! huh...!
Not quite. Try again!

2.

Please correct the following loop, which is supposed to add up the numbers from 1 to n:

Compile and run the code below in your own C environment.

#include <stdio.h>

int main(void) {
   int i, n, sum;

   printf("Please enter a positive integer: ");
   scanf("%d", &n);
    sum = 0;

   for(i=1; i<=n; i++);
          sum += i;
          
    printf("The sum from 1 to %d equals %d.", n, sum);
   
    return(0);
}

When your program performs correctly you’ll be given a keyword to enter in Canvas.

3.

Please correct the following loop, which is supposed to add up the numbers from 1 to n:

Compile and run the code below in your own C environment.

#include <stdio.h>

int main(void) {
   int i, n;
   int sum = -1;

   printf("Please enter a positive integer: ");
   scanf("%d", &n);
   printf("You entered %d.\n", n);

   for(i=1; i<=n; i++)
          sum += i;
          
    printf("The sum from 1 to %d equals %d.", n, sum);
    
    return(0);
}

When your program performs correctly you’ll be given a keyword to enter in Canvas.

Prev Top Next