Ytdyklly

I'm currently a beginner at C programming. I'm trying to create a calculator where the user inputs letter grades and it outputs the average letter grade AND average GPA.

This is nearly complete except I cannot figure out why the "Average letter grade is:" output is not functioning correctly. It works for when A is the average, and when B is the average. But whenever you enter a C, D, or F average it prints out "Average letter grade is: B" no matter what.

I'm hoping someone can help out, thanks.
PS sorry if this isn't where I should be posting this. I'm new here as well.

#include <stdio.h>

#include <stdlib.h>



int main(void)

{

   while (true){    



    unsigned int aCount = 0;

    unsigned int bCount = 0;

    unsigned int cCount = 0;

    unsigned int dCount = 0;

    unsigned int fCount = 0;



    puts("Enter the letter grades.");

    puts("Enter EOF to end input.");

    int grade; 



    while ((grade = getchar()) != EOF) {



        switch (grade) {



        case 'A':

        case 'a':

            ++aCount;

            break;



        case 'B':

        case 'b':

            ++bCount;

            break;  



        case 'C':

        case 'c':

            ++cCount;

            break;  



        case 'D':

        case 'd':

            ++dCount;

            break;  



        case 'F':

        case 'f':

            ++fCount;

            break;  



        case 'n':

        case 't':

        case ' ':

            break;  



        default:

            printf("%s", "Incorrect letter grade entered.n");

            puts("Enter a new grade.");

            break;

        }

    }





puts("nTotals for each letter grade are:");

printf("A: %un", aCount);

printf("B: %un", bCount);

printf("C: %un", cCount);

printf("D: %un", dCount);

printf("F: %un", fCount);





int gradeCount = aCount+bCount+cCount+dCount+fCount;



float aGPA = aCount*4.0;

float bGPA = bCount*3.0;

float cGPA = cCount*2.0;

float dGPA = dCount*1.0;

float fGPA = fCount*0.0;



float totalGPA = aGPA + bGPA + cGPA + dGPA + fGPA;



float avgGPA = totalGPA / gradeCount;



printf("Average GPA is: %fn", avgGPA);



    if (avgGPA >= 3.5) {

        printf("Average letter grade is: Ann");

    }

    else if (3.0 <= avgGPA < 3.5) {

        printf("Average letter grade is: Bnn");       

    }

    else if (2.0 <= avgGPA < 3.0) {

        printf("Average letter grade is: Cnn");

 }

    else if (1.0 <= avgGPA < 2.0) {

        printf("Average letter grade is: Dnn");   

    }

    else {

        printf("Average letter grade is: Fnn");

    }





}







}