Calculates an average grade for a variable number of grades - C Array

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Description

Calculates an average grade for a variable number of grades

Demo Code

#include <stdio.h>

int main(void)
{
   const int nGrades = 10;                           // Number of grades
   printf("Enter the number of grades: ");
   scanf("%zd", &nGrades);
   int grades[nGrades];                          // Array storing nGrades values
   long sum = 0L;                                // Sum of the numbers
   float average = 0.0f;                         // Average of the numbers

   printf("\nEnter the %zd grades:\n", nGrades); // Prompt for the input

                                                 // Read the ten numbers to be averaged
   for (size_t i = 0; i < nGrades; ++i)
   {/* w  w  w.  j  a v  a 2  s  .co m*/
      printf("%2zd> ", i + 1);
      scanf("%d", &grades[i]);                    // Read a grade
      sum += grades[i];                           // Add it to sum
   }

   printf("The grades you entered are:\n");
   for (size_t i = 0; i < nGrades; ++i)
   {
      printf("Grade[%2zd] = %3d  ", i + 1, grades[i]);

      if ((i + 1) % 5 == 0)                          // After 5 values
         printf("\n");                             // Go to a new line
   }

   average = (float)sum / nGrades;                 // Calculate the average

   printf("\nAverage of the %zd grades entered is: %.2f\n", nGrades, average);
}

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