change value of var

practice/sandbox/.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

practice/sandbox/src/TypeIntro.kt

 fun main() {
     var experiencePoints: Int = 5
+    experiencePoints += 5
     println(experiencePoints)
 }
\ No newline at end of file