Thread: Issue with Sum code

I have a program where I am trying to sum grades that are input by the end user. They can put in a max of 10 grades. The grades must be between 1-100. If they put in a number above or below they get an error message. When I run the program my "sum" command is adding in the grades that are in error. I was hoping someone could give me help?????

Code:

#include <stdio.h> 


    int minimum (int grades[], int no_of_grades);
    int maximum (int grades[], int no_of_grades);

int main()
{

      int grades[10], i, min_grades = 0; 
      int max_grades = 0;
      int sum = 0;
      int no_of_grades = 0;
      int avg = 0;

      do
      {

      printf ("Enter the number of grades to process (0-10): ", no_of_grades);
      scanf ("&#37;i", &no_of_grades);
      fflush (stdin);

      if (no_of_grades < 1 || no_of_grades > 10)
        printf ("Invalid number of grades.\n");
      } while (no_of_grades < 1 || no_of_grades > 10);


         for (i = 0; i < no_of_grades; i++ )
do
      {
        printf ("Enter grade for student #%i: ",i+1);
        scanf ("%i", &grades[i]);
        fflush(stdin);

        if (grades[i] <= 0 || grades[i] >= 101)
          printf ("***Invalid grade entered.  Please enter 0 - 100.***");
        sum = sum + grades[i];
         } while (grades[i] <= 0 || grades[i] >= 101);

        printf ("\nThe sum of all grades is %i",sum);
        
        avg = sum / no_of_grades;


        min_grades = minimum(grades, no_of_grades);
        max_grades = maximum(grades, no_of_grades);

        printf ("\nThe class average is %i",avg);
        printf ("\nThe minimum grade is %i",min_grades);
        printf ("\nThe maximum grade is %i",max_grades);

        getchar(); 

     } /*End Main*/

 

     

    int minimum (int grades[], int no_of_grades)

{

    int min_grades, i;

    min_grades = grades[0];

    

    for (i = 1; i  < no_of_grades; ++i)

      if (grades[i] < min_grades)

      min_grades = grades[i];

      

    return min_grades;

}
 

    int maximum (int grades[], int no_of_grades)

{

    int max_grades, i;

    max_grades = grades[0];

    

    for (i = 1; i  < no_of_grades; ++i)

      if (grades[i] > max_grades)

      max_grades = grades[i];

      

    return max_grades;

}

Apart from using fflush(stdin), see the FAQ, and some fairly poor code indentation, what seems to be the problem?

> When I run the program my "sum" command is adding in the grades that are in error
OIC, consider using 'else'