diff --git a/src/main/java/de/tilman_neumann/jml/roots/RootsReal.java b/src/main/java/de/tilman_neumann/jml/roots/RootsReal.java
index 4cae2c01..a43c0529 100644
--- a/src/main/java/de/tilman_neumann/jml/roots/RootsReal.java
+++ b/src/main/java/de/tilman_neumann/jml/roots/RootsReal.java
@@ -139,4 +139,4 @@ public static BigDecimal ithRoot(BigDecimal x, int i, BigDecimal guess, Scale re
 		
 		throw new IllegalArgumentException("x = " + x + ", but i.th root(x) is defined for x>=0 only!");
   	}
-}
\ No newline at end of file
+}
diff --git a/src/main/java/de/tilman_neumann/jml/roots/SqrtReal.java b/src/main/java/de/tilman_neumann/jml/roots/SqrtReal.java
index d06cc05f..b7136e2a 100644
--- a/src/main/java/de/tilman_neumann/jml/roots/SqrtReal.java
+++ b/src/main/java/de/tilman_neumann/jml/roots/SqrtReal.java
@@ -120,32 +120,4 @@ public static BigDecimal sqrt(BigDecimal x, BigDecimal guess, Scale resultScale)
 		
 		throw new IllegalArgumentException("x = " + x + ", but sqrt(x) is defined for x>=0 only!");
   	}
-  
-	/**
-	 * Test.
-	 * @param argv command line arguments
-	 */
-	public static void main(String[] argv) {
-    	ConfigUtil.initProject();
-
-    	if (argv.length != 2) {
-	        // wrong number of arguments !
-	        LOG.error("Usage: Sqrt <argument> <scale in decimal digits> !!");
-	        return;
-	    }
-        
-        // get argument for the sqrt function (decimal input required):
-	    BigDecimal x = new BigDecimal(argv[0]);
-	    
-        // get desired maximal precision
-	    Scale maxScale = Scale.valueOf(Integer.parseInt(argv[1]));
-        long t0, t1;
-        
-        t0 = System.currentTimeMillis();
-        for (Scale scale=Scale.valueOf(2); scale.compareTo(maxScale)<=0; scale = scale.add(1)) {
-            LOG.debug("sqrt(" + x  + ", " + scale + ")=" + sqrt(x, scale));
-        }
-        t1 = System.currentTimeMillis();
-        LOG.debug("Time of sqrt computation: " + TimeUtil.timeDiffStr(t0,t1));
-	}
-}
\ No newline at end of file
+}
diff --git a/src/test/java/de/tilman_neumann/jml/roots/RootsRealRunner.java b/src/test/java/de/tilman_neumann/jml/roots/RootsRealRunner.java
index e50a2738..86d70a3e 100644
--- a/src/test/java/de/tilman_neumann/jml/roots/RootsRealRunner.java
+++ b/src/test/java/de/tilman_neumann/jml/roots/RootsRealRunner.java
@@ -53,7 +53,7 @@ public static void main(String[] argv) {
 		        t0 = System.currentTimeMillis();
 		    	for (int i=2; i<10; i++) {
 		    		for (Scale scale = Scale.valueOf(2); scale.compareTo(maxScale)<=0; scale = scale.add(1)) {
-		        		LOG.debug(i + ".th root(" + x  + ", " + scale + ")=" + RootsReal.ithRoot(x, i, scale));
+		        		LOG.debug(i + ".th root(" + x  + ", " + scale + ") = " + RootsReal.ithRoot(x, i, scale));
 		        	}
 		        }
 		        t1 = System.currentTimeMillis();
diff --git a/src/test/java/de/tilman_neumann/jml/roots/SqrtRealRunner.java b/src/test/java/de/tilman_neumann/jml/roots/SqrtRealRunner.java
new file mode 100644
index 00000000..1cb7c3fc
--- /dev/null
+++ b/src/test/java/de/tilman_neumann/jml/roots/SqrtRealRunner.java
@@ -0,0 +1,65 @@
+/*
+ * java-math-library is a Java library focused on number theory, but not necessarily limited to it. It is based on the PSIQS 4.0 factoring project.
+ * Copyright (C) 2018-2024 Tilman Neumann - tilman.neumann@web.de
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program;
+ * if not, see <http://www.gnu.org/licenses/>.
+ */
+package de.tilman_neumann.jml.roots;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.math.BigDecimal;
+
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
+
+import de.tilman_neumann.jml.precision.Scale;
+import de.tilman_neumann.util.ConfigUtil;
+import de.tilman_neumann.util.TimeUtil;
+
+/**
+ * Test the computation of square roots of floating point numbers by user input.
+ *  
+ * @author Tilman Neumann
+ */
+public class SqrtRealRunner {
+	private static final Logger LOG = LogManager.getLogger(SqrtRealRunner.class);
+  
+	/**
+	 * Test.
+	 * @param argv command line arguments
+	 */
+	public static void main(String[] argv) {
+    	ConfigUtil.initProject();
+    	
+	   	while (true) {
+			try {
+				LOG.info("\nPlease insert <x> <maximal scale>:");
+				BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
+				String line = in.readLine();
+				String[] splitted = line.split("\\s+");
+				BigDecimal x = new BigDecimal(splitted[0]);
+				Integer maxScaleInput = Integer.parseInt(splitted[1]);
+			    Scale maxScale = Scale.valueOf(maxScaleInput);
+		        long t0, t1;
+		        
+		        t0 = System.currentTimeMillis();
+		        t0 = System.currentTimeMillis();
+		        for (Scale scale=Scale.valueOf(2); scale.compareTo(maxScale)<=0; scale = scale.add(1)) {
+		            LOG.debug("sqrt(" + x  + ", " + scale + ") = " + SqrtReal.sqrt(x, scale));
+		        }
+		        t1 = System.currentTimeMillis();
+		        LOG.debug("Time of sqrt computations: " + TimeUtil.timeDiffStr(t0,t1));
+			} catch (Exception ex) {
+				LOG.error("Error " + ex, ex);
+			}
+		}
+	}
+}