major corrections in the files - bad CPPLINT and non-compilable codes

Author: kvedala

computer_oriented_statistical_methods/Bisection_method.CPP

@@ -1,53 +1,40 @@
-#include <iostream.h>
-#include <conio.h>
-#include <math.h>
+#include <cmath>
+#include <iostream>
 
-float eq(float i)
-{
-	return (pow(i, 3) - (4 * i) - 9); // original equation
+float eq(float i) {
+    return (std::pow(i, 3) - (4 * i) - 9);  // original equation
 }
 
-void main()
-{
-	float a, b, x, z;
-	clrscr();
-	for (int i = 0; i < 100; i++)
-	{
-		z = eq(i);
-		if (z >= 0)
-		{
-			b = i;
-			a = --i;
-			goto START;
-		}
-	}
+int main() {
+    float a, b, x, z;
 
-START:
+    for (int i = 0; i < 100; i++) {
+        z = eq(i);
+        if (z >= 0) {
+            b = i;
+            a = --i;
+            break;
+        }
+    }
 
-	cout << "\nFirst initial: " << a;
-	cout << "\nSecond initial: " << b;
-	for (i = 0; i < 100; i++)
-	{
-		x = (a + b) / 2;
-		z = eq(x);
-		cout << "\n\nz: " << z << "\t[" << a << " , " << b << " | Bisect: " << x << "]";
+    std::cout << "\nFirst initial: " << a;
+    std::cout << "\nSecond initial: " << b;
+    for (int i = 0; i < 100; i++) {
+        x = (a + b) / 2;
+        z = eq(x);
+        std::cout << "\n\nz: " << z << "\t[" << a << " , " << b
+                  << " | Bisect: " << x << "]";
 
-		if (z < 0)
-		{
-			a = x;
-		}
-		else
-		{
-			b = x;
-		}
+        if (z < 0) {
+            a = x;
+        } else {
+            b = x;
+        }
 
-		if (z > 0 && z < 0.0009) // stoping criteria
-		{
-			goto END;
-		}
-	}
+        if (z > 0 && z < 0.0009)  // stoping criteria
+            break;
+    }
 
-END:
-	cout << "\n\nRoot: " << x;
-	getch();
+    std::cout << "\n\nRoot: " << x;
+    return 0;
 }

computer_oriented_statistical_methods/Newton_Raphson.CPP

@@ -1,49 +1,37 @@
-#include <iostream.h>
-#include <conio.h>
-#include <math.h>
+#include <cmath>
+#include <iostream>
 
-float eq(float i)
-{
-	return (pow(i, 3) - (4 * i) - 9); // original equation
+float eq(float i) {
+    return (pow(i, 3) - (4 * i) - 9);  // original equation
 }
 
-void main()
-{
-	float a, b, z, c, m, n;
-	clrscr();
-	for (int i = 0; i < 100; i++)
-	{
-		z = eq(i);
-		if (z >= 0)
-		{
-			b = i;
-			a = --i;
-			goto START;
-		}
-	}
+int main() {
+    float a, b, z, c, m, n;
+    for (int i = 0; i < 100; i++) {
+        z = eq(i);
+        if (z >= 0) {
+            b = i;
+            a = --i;
+            break;
+        }
+    }
 
-START:
+    std::cout << "\nFirst initial: " << a;
+    std::cout << "\nSecond initial: " << b;
+    for (int i = 0; i < 100; i++) {
+        float h, d;
+        m = eq(a);
+        n = eq(b);
 
-	cout << "\nFirst initial: " << a;
-	cout << "\nSecond initial: " << b;
-	for (i = 0; i < 100; i++)
-	{
-		float h, d;
-		m = eq(a);
-		n = eq(b);
+        c = ((a * n) - (b * m)) / (n - m);
+        a = b;
+        b = c;
 
-		c = ((a * n) - (b * m)) / (n - m);
-		a = b;
-		b = c;
+        z = eq(c);
+        if (z > 0 && z < 0.09)  // stoping criteria
+            break;
+    }
 
-		z = eq(c);
-		if (z > 0 && z < 0.09) // stoping criteria
-		{
-			goto END;
-		}
-	}
-
-END:
-	cout << "\n\nRoot: " << c;
-	getch();
+    std::cout << "\n\nRoot: " << c;
+    return 0;
 }

computer_oriented_statistical_methods/Secant_method.CPP

@@ -0,0 +1,41 @@
+#include <cmath>
+#include <iostream>
+
+float eq(float i) {
+    return (std::pow(i, 3) - (4 * i) - 9);  // original equation
+}
+float eq_der(float i) {
+    return ((3 * std::pow(i, 2)) - 4);  // derivative of equation
+}
+
+int main() {
+    float a, b, z, c, m, n;
+
+    for (int i = 0; i < 100; i++) {
+        z = eq(i);
+        if (z >= 0) {
+            b = i;
+            a = --i;
+            break;
+        }
+    }
+
+    std::cout << "\nFirst initial: " << a;
+    std::cout << "\nSecond initial: " << b;
+    c = (a + b) / 2;
+
+    for (int i = 0; i < 100; i++) {
+        float h;
+        m = eq(c);
+        n = eq_der(c);
+
+        z = c - (m / n);
+        c = z;
+
+        if (m > 0 && m < 0.009)  // stoping criteria
+            break;
+    }
+
+    std::cout << "\n\nRoot: " << z << std::endl;
+    return 0;
+}

computer_oriented_statistical_methods/newton_raphson_method.cpp

@@ -1,37 +1,28 @@
-#include <conio.h>
-#include <iostream.h>
-#include <math.h>
-float eq(float y)
-{
-	return ((3 * y) - (cos(y)) - 2);
-}
-float eqd(float y)
-{
-	return ((0.5) * ((cos(y)) + 2));
-}
 
-void main()
-{
-	float y, x1, x2, x3, sum, s, a, f1, f2, gd;
-	int i, n;
+#include <cmath>
+#include <iostream>
+
+float eq(float y) { return ((3 * y) - (cos(y)) - 2); }
+float eqd(float y) { return ((0.5) * ((cos(y)) + 2)); }
 
-	clrscr();
-	for (i = 0; i < 10; i++)
-	{
-		sum = eq(y);
-		cout << "value of equation at " << i << " " << sum << "\n";
-		y++;
-	}
-	cout << "enter the x1->";
-	cin >> x1;
-	cout << "enter the no iteration to perform->\n";
-	cin >> n;
+int main() {
+    float y, x1, x2, x3, sum, s, a, f1, f2, gd;
+    int i, n;
 
-	for (i = 0; i <= n; i++)
-	{
-		x2 = eqd(x1);
-		cout << "\nenter the x2->" << x2;
-		x1 = x2;
-	}
-	getch();
-}
+    for (i = 0; i < 10; i++) {
+        sum = eq(y);
+        std::cout << "value of equation at " << i << " " << sum << "\n";
+        y++;
+    }
+    std::cout << "enter the x1->";
+    std::cin >> x1;
+    std::cout << "enter the no iteration to perform->\n";
+    std::cin >> n;
+
+    for (i = 0; i <= n; i++) {
+        x2 = eqd(x1);
+        std::cout << "\nenter the x2->" << x2;
+        x1 = x2;
+    }
+    return 0;
+}