/**/

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

int main(){

float A, B, C, D, Grade;

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", &Grade);

if(Grade >= D){
	if(Grade >= C){
		if(Grade >= B){
			if(Grade >= A){
				printf("Student has an A grade\n");
			}
			else{
				printf("Student has an B grade\n");
			}
		}
		else{
			printf("Student has an C grade\n");
		}
	}
	else{
		printf("Student has an D grade\n");
	}
}
else{
	printf("Student has failed the course\n");
}

return 0;
}