implemented getlf

src/userinput.c

@@ -7,6 +7,7 @@
 #include <math.h>
 #include <stdbool.h>
 #include <limits.h>
+#include <float.h>
 
 #define LD(name)\
     long double name##ldvalue;\
@@ -209,3 +210,11 @@ unsigned long long getull(char *message, unsigned long long *min, unsigned long
     LD(max)
     return getNumber(message, minld, maxld, NULL, NULL, 0, ULLONG_MAX);
 }
+
+double getlf(char *message, double *min, double *max, double *greaterThan, double *smallerThan) {
+    LD(min)
+    LD(max)
+    LD(greaterThan)
+    LD(smallerThan)
+    return getNumber(message, minld, maxld, greaterThanld, smallerThanld, -DBL_MAX, DBL_MAX);
+}