/**/

#include <stdio.h>
#include <math.h>

int main() {

	float a, b, c, d, score;
		
	printf("Enter thresholds for A, B, C, D\nin that order, decreasing percentages > ");
	scanf("%f%f%f%f", &a, &b, &c, &d);
	printf("Thank you. Now enter student score (percent) >");
	scanf("%f", &score);
	if (score >= a)
		printf("Student has an A grade\n");
	else if ((score >= b) && (score < a))
		printf("Student has an B grade\n");
	else if ((score >= c) && (score < b))
		printf("Student has an C grade\n");
	else if ((score >= d) && (score < c))
		printf("Student has an D grade\n");
	else printf("Student has failed the course\n");
		
	return 0;
		
}