File content as of revision 0:f5bbc63c654b:

/*
    Project: ArrayRunSize
    File: main.cpp
    Ported to mbed/Nucleo by: Dr. C. S. Tritt
    Last revised: 10/22/17 (v. 1.1)

    Horton Program 5.7 Averaging a variable number of grades. Runtime array
    creation. Also demonstrates array output showing index values.

*/
#include "mbed.h"

int main(void)
{
    printf("\nAssure Terminal > local echo is on.\n");
    printf("Enter the number of grades: ");
    size_t nGrades = 0; // Number of grades.
    scanf("%zd", &nGrades); // The z is a type modifier for size type.
    float grade[nGrades]; // Array storing nGrades values.
    float sum = 0.0f; // Initialize sum of grades.
    printf("\nEnter the %zd grades:\n", nGrades); // Prompt for grade entry.

    // Read the grades to be averaged.
    for(size_t i = 0 ; i < nGrades ; ++i) {
        printf("%zd> ", i + 1);
        scanf("%f", &grade[i]); // Read a grade.
        sum += grade[i]; // Add it to the running sum.
    }

    // Display results.
    printf("The grades you entered are:\n");
    for(size_t i = 0 ; i < nGrades ; ++i) {
        printf("Grade[%2zd] = %.1f ", i + 1, grade[i]);
        if ((i+1) % 5 == 0) printf("\n"); // After 5 values, go to a new line.
    }

    float average = sum/nGrades; // Calculate and display the average.
    printf("\nAverage of the %zd grades entered is: %.2f\n", nGrades, average);
    while (true) {};
}