#include <stdio.h>

int main(void) {
	float s = 0;
	float start = 0.5;
	float end = 2;
	float r = 0.5;
	for (float i = start; i <= end; i += r ){
			s += i;
	}
	printf("%f == %f", s, 0.5 + 1 + 1.5 + 2);
	return 0;
}