diff --git a/du3/program.c b/du3/program.c
index e0006b3..d43389e 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -91,11 +91,11 @@ int main()
                 {
                     //ak je to nejaky printable symbol ('*/-,:./), skontroluj ci to nie je artimeticke znamienko alebo desatinna bodka,
                     //AK NIE, povazuj za riadok neplatny...
-                    if (i == '+' || i == '-' || i == '/' i == '*')
+                    if (strBuffer[i] == '+' || strBuffer[i] == '-' || strBuffer[i] == '/' strBuffer[i] == '*')
                     {
                         op1 = i;
                     }
-                    else if (i = '.')
+                    else if (strBuffer[i] = '.')
                     {
                         //zisti, kde treba zapisat desatinnu bodku
                         switch (writeIntoArrayNum)
@@ -131,7 +131,7 @@ int main()
             //** konecna faza = vypisovanie vysledkov
 
             //ak systematicka chyba
-            if (isLineInvalid = true || op == 'N' || IsArithCorrect(strtof(num1Temp),strtof(num2Temp), op1) == -1)
+            if (isLineInvalid = true || op == 'N' || IsArithCorrect(strtof(num1Temp, strtofEndPtr),strtof(num2Temp, strtofEndPtr), op1) == -1)
             {
                 printf("CHYBA\n");
             }