/* arrays in C

write a program that reads 10 grades, store grades in array of integers
and finds the number of passing grades, failing grades, and average in each
category and total average.

*/

#include<stdio.h>

#define SIZE 10
//SIZE is a constant variable
//predefined, has value 10 and CANNOT be change through the program

int main(){
	int grades[SIZE]={0},i,count_pass=0,count_fail=0,sum_pass=0,sum_fail=0;
	double ave_pass, ave_fail,ave_total;

	printf("enter %d grades\n",SIZE);
	for(i=0;i<SIZE;i++){
		scanf("%d",&grades[i]);
	}
	printf("grades are\n");
	for(i=0;i<SIZE;i++){
		printf("%d ",grades[i]);
	}
	printf("\n");
	
	for(i=0;i<SIZE;i++){
		if(grades[i]>=60){
			count_pass++;
			sum_pass+=grades[i];
		}
		else{
			count_fail++;
			sum_fail+=grades[i];
		}
	}


	ave_total=(double)(sum_pass+sum_fail)/SIZE;
	printf("average grade is %.2f\n",ave_total);
	if(count_pass>0){
		ave_pass=(double)(sum_pass)/SIZE;
		printf("%d passing grades,ave=%.2f\n",count_pass, ave_pass);
	}
	else{	
		printf("no passing grades\n");
	}


	if(count_fail>0){
                ave_fail=(double)(sum_fail)/SIZE;
                printf("%d failing grades,ave=%.2f\n",count_fail, ave_fail);
        }
        else{
                printf("no failing grades\n");
        }






	return 0;
}