diff --git a/project.yml b/project.yml
index e253248..a54e1f4 100644
--- a/project.yml
+++ b/project.yml
@@ -88,7 +88,7 @@
   :placement: :end
   :flag: "-l${1}"
   :path_flag: "-L ${1}"
-  :system: []    # for example, you might list 'm' to grab the math library
+  :system: [m]    # for example, you might list 'm' to grab the math library
   :test: []
   :release: []
 
diff --git a/src/userinput.c b/src/userinput.c
index ec1a8f1..9792e50 100644
--- a/src/userinput.c
+++ b/src/userinput.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
 
 void trimLeft(char *input) {
     size_t length = strlen(input);
@@ -69,4 +70,13 @@ char *getstr(char *message, unsigned long *minLength, unsigned long *maxLength)
         result = readInput();
     }
     return result;
+}
+
+void printlf(long double value) {
+    if (roundl(value) == value) {
+        printf("%.0Lf", value);
+    }
+    else {
+        printf("%Lf", value);
+    }
 }
\ No newline at end of file