1 files changed, 11 insertions, 1 deletions
diff --git a/src/tools.c b/src/tools.c
index 2b7e85d..5912819 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -1,5 +1,5 @@
 /*
-Copyright 2015 Ian Jauslin
+Copyright 2015-2022 Ian Jauslin
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -140,3 +140,13 @@ int min(int x1, int x2){
     return(x2);
   }
 }
+
+// check whether a divides b
+int is_factor(int a, int b){
+  if(b-a*(b/a)==0){
+    return(1);
+  }
+  else{
+    return(0);
+  }
+}