final.c

/*Programmer Chase Singhofen
Date 10/8/16
Specifications: Ask the user to enter test scores.
When they have entered all the tests scores,
they will enter the value of -1. The Program
will sum up all the scores entered, and output sum.
70, 80, 90, -1. Expected 240*/

#include<stdio.h>
#include<stdlib.h>

main() {

	double score, sum = 0, grade = 0, gradeNum = 0, avg = 0, pass = 0, totalGrades = 0;
	printf("Enter a test score(-1 to quit):");
	scanf_s("%lf", &grade);
	while (grade != -1)
	{

		if (grade <= 100 && grade >= 70) {
			pass++;
			printf("Pass: %.2lf\n", pass);
		}
		if (grade > 100 || grade <0) {
			printf("Error, grade is not in grade range\n");
		}
		if (grade >= 0 && grade <= 100) {
			totalGrades++;
		}
		printf("Enter a test score(-1 to quit):");
		scanf_s("%lf", &grade);
	}
	avg = 100 * pass / totalGrades;
	printf("\nThe percent of passing grades is : %.2lf\n", avg);
	system("pause");

}