Coursework for to while

ETC Homework & Coursework Questions
1

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

  1. The problem statement, all variables and given/known data:
    The problem i have would be printf("Average of %u values is %f.\n",n (n == 0) ? 0.0 : (double) sum / n); in the code on #3 because i have no idea what this means and apparently it is the problem for compiling. I have ask a few experience programmers and they say its another way to write a for statement is that true?
    I am changing the codes for statement to while just for a heads up.

  2. Relevant commands, code, scripts, algorithms:

/*      File : avg.c            *
 *      By   :                  *
 *      login:                  *
 *      team :                  *
 *      Date :                  */

/*
 * Compute average of its input values.
 */

#include <stdio.h>

int main()
{
  int          next;               /* next input value */
  long         sum;                /* running total */
  unsigned int n;                  /* number of input values */
  int          result;             /* did we read another value? */
  double       avg;                /* average of input values */

        for (sum = n = 0;
             (result = scanf("%d", &next)) == 1;
             n++)
                sum += next;   
        if (result != EOF)
                printf("Warning: bad input after reading %u values\n", n);
        printf("Average of %u values is %f.\n",
               n, (n == 0) ? 0.0 : (double) sum / n);
  
}
  1. The attempts at a solution (include all code and scripts):
/*      File : avg.c            *
 *       *      By   :Matthew Yee                  *
 *        *      login: mgy                 *
 *         *      team : Yun                 *
 *          *      Date : 04/05/2011                 */

/*
 *  * Compute average of its input values.
 *   */

#include <stdio.h>

int main()
{
  int          next;               /* next input value */
  long         sum;                /* running total */
  unsigned int n;                  /* number of input values */
  int          result;             /* did we read another value? */
  double       avg;                /* average of input values */
  sum = n = 0;
       

     while(result = scanf("%d", &next) == 1){
            n++; 
            sum += next; } 
            
                // n++;
                //sum += next;   
        if (result != EOF)
                printf("Warning: bad input after reading %u values\n", n);
        printf("Average of %u values is %f.\n",n (n == 0) ? 0.0 : (double) sum / n);
  
}
  1. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
    University of Hawaii at Manoa, Honollulu (HI), Oahu(Hawaii), Tep Dobry, EE160 EE 160: Lab 10

Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

2

That is no for-loop at all, but a if-then-else. In standard C

<condition> ? <command1> : <command2>

is just an abbreviated way of writing

if( <condition> ) {
     <command1> ;
} else {
      <command2> ;
}

It will do absolutely the same.

I hope this helps.

bakunin

1 Like
3

I think you dropped a comma.

printf("Average of %u values is %f.\n",n , (n == 0) ? 0.0 : (double) sum / n);
4

the program works now but the average show 0 every time i put an input. i think that it is my variable sum because the n variable went through other wise the math would be wrong. the sum kept seeing it as 0 and n sees it as how many variables there are going to be type in input. for example if i type 3 values, enter, type the values like 1 2 3 the average came to be zero

5

You have commented the only place where "sum" is incremented - small wonder it remains 0 all the time. ;-))

bakunin

1 Like