From 63ea12bc3dc413a34a146b35307aa3bf32bd5641 Mon Sep 17 00:00:00 2001
From: Krishna Vedala <7001608+kvedala@users.noreply.github.com>
Date: Wed, 10 Jun 2020 12:50:09 -0400
Subject: [PATCH] update independent variable in the main loop

---
 numerical_methods/ode_forward_euler.c  | 1 +
 numerical_methods/ode_midpoint_euler.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/numerical_methods/ode_forward_euler.c b/numerical_methods/ode_forward_euler.c
index 9d98255ea..5df0067b6 100644
--- a/numerical_methods/ode_forward_euler.c
+++ b/numerical_methods/ode_forward_euler.c
@@ -116,6 +116,7 @@ int main(int argc, char *argv[])
     {
         fprintf(fp, "%.4g,%.4g,%.4g\n", x, y[0], y[1]); // write to file
         forward_euler(dx, &x, y, dy);                   // perform integration
+        x += dx;                                        // update step
     } while (x <= X_MAX); // till upper limit of independent variable
     /* end of integration */
 
diff --git a/numerical_methods/ode_midpoint_euler.c b/numerical_methods/ode_midpoint_euler.c
index 6c4087515..5be3c0900 100644
--- a/numerical_methods/ode_midpoint_euler.c
+++ b/numerical_methods/ode_midpoint_euler.c
@@ -124,6 +124,7 @@ int main(int argc, char *argv[])
     {
         fprintf(fp, "%.4g,%.4g,%.4g\n", x, y[0], y[1]); // write to file
         midpoint_euler(dx, &x, y, dy);                  // perform integration
+        x += dx;                                        // update step
     } while (x <= X_MAX); // till upper limit of independent variable
     /* end of integration */