Initial commit.

src/main.c

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2016 Nicolás A. Ortega
+ * License: GNU GPLv3
+ */
+#include <stdio.h>
+#include <math.h>
+
+inline double func(double x);
+
+int main(void) {
+	double a, b;
+	printf("Enter \"min, max\": ");
+	scanf("%lf, %lf", &a, &b);
+
+	unsigned int parts;
+	printf("Number of parts: ");
+	scanf("%u", &parts);
+
+	double lRect, rRect, mRect, trap, simp;
+	lRect = rRect = mRect = trap = simp = 0;
+	for(unsigned int i = 0; i < parts; ++i) {
+		double p0 = a + (i * (b - a) / parts);
+		double p1 = p0 + ((b - a) / parts);
+		lRect += func(p0) * (p1 - p0);
+		rRect += func(p1) * (p1 - p0);
+		mRect += func((p0 + p1) / 2) * (p1 - p0);
+		trap += (func(p0) + func(p1)) / 2 * (p1 - p0);
+		simp += (p1 - p0) / 6 * (func(p0) + func(p1) + 4 * func((p0 + p1) / 2));
+	}
+
+	printf("Left Rectangle: %lf\n", lRect);
+	printf("Right rectangle: %lf\n", rRect);
+	printf("Middle Point Rectangle: %lf\n", mRect);
+	printf("Trapezoidal: %lf\n", trap);
+	printf("Simpson: %lf\n", simp);
+
+	return 0;
+}
+
+double func(double x) {
+	return pow(x, 3.0) + 4.0 * x - 2.0;
+}