If the line is empty, a zero is added, an icon is added to the About …

…window title

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pyqulator"
-version = "1.7.1"
+version = "1.8.0"
 dependencies = [
   "PyQt6>=6.4.2",
   "sympy>=1.13.3",

src/pyqulator/main.py

@@ -232,34 +232,44 @@ def log(self):
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def sin(self):
         try:
             res = sin(sympify(self.current_line_result.text()).evalf())
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def cos(self):
         try:
             res = cos(sympify(self.current_line_result.text()).evalf())
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def tan(self):
         try:
             res = tan(sympify(self.current_line_result.text()).evalf())
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def exp(self):
         try:
             res = exp(sympify(self.current_line_result.text()).evalf())
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def pi(self):
         try:
@@ -270,6 +280,8 @@ def pi(self):
                 self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def e(self):
         try:
@@ -280,27 +292,35 @@ def e(self):
                 self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def procent(self):
         try:
             res = (sympify(self.current_line_result.text()) / Rational(100)).evalf()
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def radical(self):
         try:
             res = (sympify(self.current_line_result.text())).evalf()
             self.current_line_result.setText(str(sqrt(res)).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     def square(self):
         try:
             res = (sympify(self.current_line_result.text()) * sympify(self.current_line_result.text())).evalf()
             self.current_line_result.setText(str(res).rstrip("0").rstrip("."))
         except Exception as e:
             QMessageBox.warning(self, "Error", str(e))
+        if self.current_line_result.text() == "":
+            self.current_line_result.setText("0")
 
     # Journal functions
     def clear_journal(self):
@@ -569,6 +589,7 @@ def show_about_program(self):
         """
         self.about_msg.setText(msg_text)
         icon = QIcon.fromTheme("accessories-calculator")
+        self.about_msg.setWindowIcon(icon)
         self.about_msg.setIconPixmap(icon.pixmap(32, 32))
         self.about_msg.exec()