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

float s_trap_brut (float a, float b, float step){
	
	if((a == b) || (step == 0.0))
		return 0.0;
	
	float sum = 0;
	float i;
	for(i = a; i < b; i += step){
		sum += ((pow(M_E, i) + pow(M_E, i+step)) * step) / 2;
	}
	
	return sum;
}

int main(void) {
	
	printf("S trapez: %f", s_trap_brut(0, 1, 0.1));
	return 0;
}