/* Demonstrate assertions in C
  * If the expression in the parentheses is 0, then the assert
  * function sends a SIGABRT signal
  */
// GPACalc.c
#include <stdio.h>
#include <assert.h>

float GPACalc (int size, float *ary) {
	float sum = 0;
	for (int i = 0; i < size; i++) {
		// check invalid grade
		assert (ary[i] >= 0.0 && ary[i] <= 4.3);
		sum += ary[i];
	}
	return sum/size;
}

int main () {
	float a[] = {3.5, 3.8, 4.0, 4.1, 4.5};
	
	printf("%f\n", GPACalc(5, a));
    
     return 0;
}