diff --git a/du4/program.c b/du4/program.c
index 97f1d46..a803652 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,19 +1,86 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-int main(){
-float value = 0;
-char znaky[13] = "1.1 2.2 3.3";
-char* koniec_pola = znaky + strlen(znaky);
-char* koniec_cisla = NULL;
-char* zaciatok_cisla = znaky;
-while (zaciatok_cisla < koniec_pola){
-    value = strtof(zaciatok_cisla,&koniec_cisla);
-    if (value == 0){
-        break;
+#include <assert.h>
+#include <math.h>
+#include <ctype.h>
+#define LINE_SIZE 150
+
+int main() {
+    char znaky[LINE_SIZE];
+    char* r = NULL;
+    int symbol[LINE_SIZE];
+    int sym = 0;
+    char* koniec_cisla = NULL;
+    char* zaciatok_cisla = znaky;
+    //char* koniec_pola;
+    float cislo = 0.0;
+    float a = 0;
+    float b = 0;
+    float c = 0;
+    int counter = 0;
+    float sr= 0;
+    while ((r = fgets(znaky, LINE_SIZE, stdin)) != NULL) {
+	if(znaky[0] == '\n'){
+	break;
+	}
+	for (int i = 0; i < strlen(znaky); i++) {  
+	if (znaky[i] == '*' || znaky[i] == '/' || znaky[i] == '-' || znaky[i] == '+' || znaky[i] == '=') {
+                symbol[sym] = znaky[i];
+                znaky[i] = ' ';
+                sym++;
+        }
+        }
+        zaciatok_cisla = znaky;
+        while (*zaciatok_cisla != '\0') {
+            cislo = strtof(zaciatok_cisla, &koniec_cisla);
+            if (zaciatok_cisla == koniec_cisla) {
+                zaciatok_cisla++;
+            } else {
+                if(counter == 0){
+		a = cislo;
+		}
+		if(counter == 1){
+		b = cislo;
+		}
+		if(counter == 2){
+		c = cislo;
+		}
+		counter++;
+		//printf("Nasiel som cislo %f\n", cislo);
+                zaciatok_cisla = koniec_cisla + 1;
+            }
+        }
     }
-    printf("Nasiel som cislo %f\n",value);
-    zaciatok_cisla = koniec_cisla + 1;
-}
-return 0;
+	if(symbol[sym - 2] == '+'){
+	sr = a + b; 
+	//printf("%2.f", sr);
+	}
+	if(symbol[sym - 2] == '-'){
+	sr = a - b; 
+	//printf("%2.f", sr);
+	}
+	if(symbol[sym - 2] == '*'){
+	sr = a * b; 
+	//printf("%2.f", sr);
+	}
+	if(symbol[sym - 2] == '/'){
+	sr = a / b; 
+	//printf("%2.f", sr);
+	}
+	if(c == sr){
+	printf("OK\n");
+	}
+	else{
+	printf("CHYBA\n");
+	}
+    if (feof(stdin)) {
+        printf("Dostal som sa na koniec suboru\n");
+    }
+    
+    return 0;
 }
+
+
+
+