Answer to Question #207043 in C for tafadzwa

Question

assign a letter grade based on the test percentage according to the following rules

80 to 100 A

70 to 79 B

60 to 69 C

50 to 59 D

0-49 F

display an appropriate message with the test percentage and letter grade for the student . Accumulate the number and total of all the percentages . after all the input calculate the average percentage from valid percentages entered .display the average percentage, number of passes, number of fails and number of invalid percentages

Answer 1

#include <stdio.h>


int main()
{
    int persantage;
    char grade;
    int countPass=0, countFail=0, countInvalid=0;
    int total=0;
    char ans;
    double avg;


    do {
        printf("Enter an test percentage - ");
        scanf("%d", &persantage);


        if (persantage > 100 || persantage < 0) {
            countInvalid++;
            grade = '\0';
        }
        else if (persantage >= 80) {
            countPass++;
            total += persantage;
            grade = 'A';
        }
        else if (persantage >= 70) {
            countPass++;
            total += persantage;
            grade = 'B';
        }
        else if (persantage >= 60) {
            countPass++;
            total += persantage;
            grade = 'C';
        }
        else if (persantage >= 50) {
            countPass++;
            total += persantage;
            grade = 'D';
        }
        else {
            countFail++;
            total += persantage;
            grade = 'F';
        }
        if (grade != '\0') {
            printf("The grade is %c\n", grade);
        }


        printf("Another grade? (y/N) - ");
        fgetchar();         // to skip eol
        ans = fgetchar();


    } while (ans == 'y' || ans == 'Y');



    if (countPass + countFail) {
        avg = (double) total / (double) (countPass + countFail);
        printf("Average percantage is %.2f%%\n", avg);
    }
    printf("%d passed, %d failed, %d invalid entries\n", countPass, countFail, countInvalid);


    return 0;
}