diff --git a/du2/program.c b/du2/program.c
index be961f1..b067fb0 100644
--- a/du2/program.c
+++ b/du2/program.c
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <string.h>
+
 
 int main(){
     double koef=0;
@@ -10,7 +10,7 @@ int main(){
         printf("Nepodarilo sa nacitat zaklad x\n");
         return 0;
          }else{ while (scanf("%lf", &koef) == 1) {
-            if(strlen(koef) !='\0'){
+            if(koef !='\0'){
         rishennia=rishennia*a +koef;
         i++;
             }else{ printf("Vysledok je: %.2f\n", rishennia);