diff --git a/du4/program.c b/du4/program.c
index 8992694..8679b8e 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -4,33 +4,32 @@
 #include <string.h>
 #include <stdbool.h>
 
-int main(){
-    char* input = (char*) calloc (100, sizeof(char));
+int main() {
+    char* input = (char*) calloc(100, sizeof(char));
     char symbol;
     int counter;
     int operation;
-    char* number1 = (char*) calloc (25, sizeof(char));
-    char* number2 = (char*) calloc (25, sizeof(char));
-    char* result = (char*) calloc (30, sizeof(char));
+    char* number1 = (char*) calloc(25, sizeof(char));
+    char* number2 = (char*) calloc(25, sizeof(char));
+    char* result = (char*) calloc(30, sizeof(char));
     char* ptr;
     bool equals = false;
 
     for(int i = 0; fgets(input, 100, stdin) != NULL; i++){
-        if(!input || !strcmp(input, "") || input[0] == EOF || input[0] == '\n' || input[0] == '\0') 
+        if(!input || !strcmp(input, "") || input[0] == EOF || input[0] == '\n' || input[0] == '\0')
             break;
         counter = 0;
         operation = 0;
         equals = false;
         memset(number1, '\0', 25);
         memset(number2, '\0', 25);
-
-        while (input[counter] != '\0' && input[counter] != '\n'){
+        while(input[counter] != '\0' && input[counter] != '\n'){
             symbol = input[counter++];
-            while(isspace(symbol))
+            while (isspace(symbol))
                 symbol = input[counter++];
             if(symbol == '\0' || symbol == '\n')
                 break;
-            switch(symbol){
+            switch (symbol) {
                 case '+':
                     operation = 1;
                     break;
@@ -47,19 +46,19 @@ int main(){
                     equals = true;
                     break;
                 default:
-                    if(isdigit(symbol) || symbol == '.'){
-                        if(operation == 0) 
+                    if (isdigit(symbol) || symbol == '.'){
+                        if (operation == 0)
                             number1 += symbol;
-                        else if (!equals)
+                        else if(!equals)
                             number2 += symbol;
                         else
                             result += symbol;
                     }
-                    else {
-                        printf("CHYBA");
+                    else{
+                        printf("CHYBA\n");
                         goto LABEL;
                     }
-                    break; 
+                    break;
             }
         }
         LABEL:
@@ -68,18 +67,18 @@ int main(){
                 printf("%s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) + strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                 break;
             case 2:
-                printf("%s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) - strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
+                printf("%s\n", (strtof(number1, &ptr) - strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) - strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                 break;
             case 3:
-                printf("%s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) * strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
+                printf("%s\n", (strtof(number1, &ptr) * strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) * strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                 break;
             case 4:
-                printf("%s\n", (strtof(number1, &ptr) + strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) / strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
+                printf("%s\n", (strtof(number1, &ptr) / strtof(number2, &ptr) > strtof(result, &ptr) - 0.001 && strtof(number1, &ptr) / strtof(number2, &ptr) < strtof(result, &ptr) + 0.001) ? "OK" : "ZLE");
                 break;
             default:
-                printf("CHYBA");
+                printf("CHYBA\n");
         }
     }
 
     return 0;
-}
+}
\ No newline at end of file