diff --git a/du4/program b/du4/program
index cf3e0d4..713cc11 100755
Binary files a/du4/program and b/du4/program differ
diff --git a/du4/program.c b/du4/program.c
index 766d97b..6cd1b0c 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -2,75 +2,145 @@
 #include <string.h>
 #include <stdlib.h>
 #include <math.h>
+#include <ctype.h>
 
 
 
-int main() {
+int main(){
 
-       int i,j; // pro cyklus
-       double number1, number2, summary, rsum, msum; /*aby se mohlo počítat s desetinnými čísly*/
-       char operand, equ; //načítání znaků
-         
-      scanf("%lf", &number1); // nacte prvni cislo, znamenko, druhe cislo
-      scanf("%c", &operand);
-      scanf("%lf", &number2);
-      scanf("%c", &equ);
-      scanf("%lf",&msum);
+       int i,j; 
+       double number1, number2, summary, rsum, msum; 
+       char operand, equ; 
+/*       char input[1000];
+       char num_str[30] = {0};
+       float numbers[3];
+       fgets(input, 999, stdin);
+       for (int i = 0, j =0; i < strlen(input); i++) {
+         char c = input[i];
+          if (c==' ') continue;
+          if (c=='+') operand='+';
+          if (c=='-') operand='-';
+          if (c=='*') operand='*';
+          if (c=='/') operand='/';
+          if (c=='\n') break;
+          if (isdigit(c)) {num_str[j++] = c - '0';}
+          else if (j > 0) {
+            j = 0;
+            numbers[...] = atof(num_str);
+          }
+          }
+       }
+      // scanf("%lf", &number1); 
+      //scanf("%lf", &number2);
+      //scanf("%lf",&msum);
       
+
+*/ 
+    char* input = calloc(1000, 1);
+    while (1) {
+       
+        input = fgets(input, 1000, stdin);
+        if (input == NULL) break;
+ 
+        fflush(stdin); 
+        if (input[0] == '\n' || input[0] == EOF || strlen(input) <= 0)
+            break;
+ 
+        float values[3] = {0};
+        char operation = 0;    
+        
+        int k = 0; 
+        int num = strlen(input);
+        for (int i = 0; i < num; i++) {
+           
+            if (input[i] == ' ')
+                continue;
+ 
+            if (isalpha(input[i]))
+                break;
+ 
             
-          /*pokud se operand rovna deleni a delitel se rovna nule vypise chybu*/
-          if((operand == '/') && (number2 == 0)){
+            if (i < strlen(input) && (isdigit(input[i]) || input[i] == '.' || (input[i] == '-' && isdigit(input[i + 1])))) {
+                char temp[100] = {0}; 
+                for (int j = 0; i < strlen(input) && (isdigit(input[i]) || input[i] == '.' || input[i] == '-'); j++) {
+                    temp[j] = input[i++];
+                }
+                i--;
+                
+                values[k++] = (float)atof(temp);
+            } else if (isdigit(input[i]) == 0 && input[i] != ' ' && input[i] != '\n' && input[i] != '=') {
+                
+                operation = input[i];
+            }
+        }
+ 
+        
+        if (k != 3) {
+            printf("CHYBA\n");
+            continue;
+        }
+ 
+        
+        if (operation == 0 && values[1] < 0) {
+            operation = '-';
+            values[1] = abs(values[1]); 
+        }
+ 
+       
+        float result = 0;     
+      
+      
+      
+////////////////////////////////////////////////  
+      
+          /*if((operand == '/') && (number2 == 0)){
                 printf("Nulou sa nedá deli");
           }
           if(operand !='+' && operand !='-' && operand !='*' && operand !='/'){
               return 1;
               printf("\n");  
-          }         
-          if(equ !='='){
-             return 1;
-             printf("\n");
-            
-          }                  
-          
-          else if(operand=='+'){
-                        rsum=number1+number2;
+          }                         
+          */
+          msum=values[2];
+          if(operation=='+'){
+                        rsum=values[0]+values[1];
                         if(msum==rsum){
                           printf("OK\n");
                         }
                         else{
                           printf("ZLE\n");
                         }
-                        printf("%lf\n",rsum);
+                        //printf("%lf\n",rsum);
           } 
-          else if(operand=='-'){
-                        rsum=number1-number2;
+          else if(operation=='-'){
+                        rsum=values[0]-values[1];
                         if(msum==rsum){
                           printf("OK\n");
                         }
                         else{
                           printf("ZLE\n");
                         }
-                        printf("%lf\n",rsum);
+                        //printf("%lf\n",rsum);
           }
-          else if(operand=='*'){
-                        rsum=number1*number2;
+          else if(operation=='*'){
+                        rsum=values[0]*values[1];
                         if(msum==rsum){
                           printf("OK\n");
                         }
                         else{
                           printf("ZLE\n");
                         }
-                        printf("%lf\n",rsum); 
+                        //printf("%lf\n",rsum); 
           }
-          else if(operand=='/'){
-                        rsum=number1/number2;
+          else if(operation=='/'){
+                        rsum=values[0]/values[1];
                         if(msum==rsum){
                           printf("OK\n");
                         }
                         else{
                           printf("ZLE\n");
                         }
-                        printf("%lf\n",rsum);
-          }  
-}  
-
+                        //printf("%lf\n",rsum);
+          }
+          }
+          }  
\ No newline at end of file