made functions static to files

*BUG* in CPP lint github action

computer_oriented_statistical_methods/Gaussian_elimination.cpp

@@ -1,29 +1,23 @@
 #include <iostream>
-using namespace std;
 
-int main()
-{
+int main() {
     int mat_size, i, j, step;
 
-    cout << "Matrix size: ";
-    cin >> mat_size;
+    std::cout << "Matrix size: ";
+    std::cin >> mat_size;
 
     double mat[mat_size + 1][mat_size + 1], x[mat_size][mat_size + 1];
 
-    cout << endl
-         << "Enter value of the matrix: " << endl;
-    for (i = 0; i < mat_size; i++)
-    {
-        for (j = 0; j <= mat_size; j++)
-        {
-            cin >> mat[i][j]; //Enter (mat_size*mat_size) value of the matrix.
+    std::cout << std::endl << "Enter value of the matrix: " << std::endl;
+    for (i = 0; i < mat_size; i++) {
+        for (j = 0; j <= mat_size; j++) {
+            std::cin >>
+                mat[i][j];  // Enter (mat_size*mat_size) value of the matrix.
         }
     }
 
-    for (step = 0; step < mat_size - 1; step++)
-    {
-        for (i = step; i < mat_size - 1; i++)
-        {
+    for (step = 0; step < mat_size - 1; step++) {
+        for (i = step; i < mat_size - 1; i++) {
             double a = (mat[i + 1][step] / mat[step][step]);
 
             for (j = step; j <= mat_size; j++)
@@ -31,24 +25,20 @@ int main()
         }
     }
 
-    cout << endl
-         << "Matrix using Gaussian Elimination method: " << endl;
-    for (i = 0; i < mat_size; i++)
-    {
-        for (j = 0; j <= mat_size; j++)
-        {
+    std::cout << std::endl
+              << "Matrix using Gaussian Elimination method: " << std::endl;
+    for (i = 0; i < mat_size; i++) {
+        for (j = 0; j <= mat_size; j++) {
             x[i][j] = mat[i][j];
-            cout << mat[i][j] << " ";
+            std::cout << mat[i][j] << " ";
         }
-        cout << endl;
+        std::cout << std::endl;
     }
-    cout << endl
-         << "Value of the Gaussian Elimination method: " << endl;
-    for (i = mat_size - 1; i >= 0; i--)
-    {
+    std::cout << std::endl
+              << "Value of the Gaussian Elimination method: " << std::endl;
+    for (i = mat_size - 1; i >= 0; i--) {
         double sum = 0;
-        for (j = mat_size - 1; j > i; j--)
-        {
+        for (j = mat_size - 1; j > i; j--) {
             x[i][j] = x[j][j] * x[i][j];
             sum = x[i][j] + sum;
         }
@@ -57,7 +47,7 @@ int main()
         else
             x[i][i] = (x[i][mat_size] - sum) / (x[i][i]);
 
-        cout << "x" << i << "= " << x[i][i] << endl;
+        std::cout << "x" << i << "= " << x[i][i] << std::endl;
     }
     return 0;
 }

computer_oriented_statistical_methods/bisection_method.cpp

@@ -1,7 +1,7 @@
 #include <cmath>
 #include <iostream>
 
-float eq(float i) {
+static float eq(float i) {
     return (std::pow(i, 3) - (4 * i) - 9);  // original equation
 }
 

computer_oriented_statistical_methods/false-position.cpp

@@ -1,9 +1,11 @@
-#include<stdlib.h>
-#include <math.h>
+#include <cmath>
+#include <cstdlib>
 #include <iostream>
-float eq(float i) {
+
+static float eq(float i) {
     return (pow(i, 3) - (4 * i) - 9);  // origial equation
 }
+
 int main() {
     float a, b, z, c, m, n;
     system("clear");
@@ -12,12 +14,13 @@ int main() {
         if (z >= 0) {
             b = i;
             a = --i;
-            goto START;
-            }
+            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);
@@ -26,10 +29,10 @@ int main() {
         a = c;
         z = eq(c);
         if (z > 0 && z < 0.09) {  // stoping criteria
-            goto END;
+            break;
         }
     }
-    END:
+
     std::cout << "\n\nRoot: " << c;
-    system("pause");
+    return 0;
 }

computer_oriented_statistical_methods/newton_raphson_method.cpp

@@ -1,10 +1,11 @@
 #include <cmath>
 #include <iostream>
 
-float eq(float i) {
+static float eq(float i) {
     return (std::pow(i, 3) - (4 * i) - 9);  // original equation
 }
-float eq_der(float i) {
+
+static float eq_der(float i) {
     return ((3 * std::pow(i, 2)) - 4);  // derivative of equation
 }
 

computer_oriented_statistical_methods/secant_method.cpp

@@ -1,7 +1,7 @@
 #include <cmath>
 #include <iostream>
 
-float eq(float i) {
+static float eq(float i) {
     return (pow(i, 3) - (4 * i) - 9);  // original equation
 }
 

computer_oriented_statistical_methods/successive_approximation.cpp

@@ -1,9 +1,8 @@
-
 #include <cmath>
 #include <iostream>
 
-float eq(float y) { return ((3 * y) - (cos(y)) - 2); }
-float eqd(float y) { return ((0.5) * ((cos(y)) + 2)); }
+static float eq(float y) { return ((3 * y) - (cos(y)) - 2); }
+static float eqd(float y) { return ((0.5) * ((cos(y)) + 2)); }
 
 int main() {
     float y, x1, x2, x3, sum, s, a, f1, f2, gd;