diff --git a/cv3/program.c b/cv3/program.c
index d9d2e9b..ec49735 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -1,40 +1,104 @@
-#include<stdio.h>
-#include<stdlib.h>
-#include<string.h>
-#include<ctype.h>
-#include<assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <ctype.h>
 
 #define LINE_SIZE 100
-#define STACK_SIZE 100
+#define STACK_SIZE 10
 
-struct stack{
-	float values[LINE_SIZE];
-	int size;
+struct stack {
+    float values[STACK_SIZE];
+    int size;
 };
 
-void print_stack(struct stack* stack){
-	for (int i = 0; i < stack->size; i++){
-		printf("%.0f", stack->values[i]);
-	}
-	printf("\n");
+void print_stack(struct stack* stack) {
+    for (int i = 0; i < stack->size; i++) {
+        printf("%.2f ", stack->values[i]);
+    }
+    printf("\n");
 }
 
-int main(){
-	char input[LINE_SIZE]; float y; struct stack mystack;
-	memset(&mystack, 0, sizeof(struct stack));
-
-	while(fgets(input, LINE_SIZE, stdin) != NULL){
-		input[strlen(input - 1)] = '\0';
-		if(sscanf(input, "\f", &y) == 1){
-			printf("Success!\n");
-			assert(mystack.size < STACK_SIZE);
-			mystack.values[mystack.size] = y;
-			mystack.size ++;
-		} else{
-		  return 1;
-		}
-		print_stack(&mystack);
-	}
-	return 0;
+void push_stack(struct stack* stack, float value) {
+    if (stack->size >= STACK_SIZE) {
+        printf("Chyba: zasobnik je plny\n");
+        exit(1);
+    }
+    stack->values[stack->size] = value;
+    stack->size++;
+}
+
+float pop_stack(struct stack* stack) {
+    if (stack->size == 0) {
+        printf("Chyba: zasobnik je prazdny\n");
+        exit(1);
+    }
+    stack->size--;
+    return stack->values[stack->size];
+}
+
+int is_operator(char* input) {
+    return (strcmp(input, "+") == 0 || strcmp(input, "-") == 0 ||
+            strcmp(input, "*") == 0 || strcmp(input, "/") == 0);
+}
+
+void perform_operation(struct stack* stack, char* operator) {
+    if (stack->size < 2) {
+        printf("Chyba: nedostatok operandov\n");
+        exit(1);
+    }
+
+    float b = pop_stack(stack);
+    float a = pop_stack(stack);
+    float result;
+
+    if (strcmp(operator, "+") == 0) {
+        result = a + b;
+    } else if (strcmp(operator, "-") == 0) {
+        result = a - b;
+    } else if (strcmp(operator, "*") == 0) {
+        result = a * b;
+    } else if (strcmp(operator, "/") == 0) {
+        if (b == 0) {
+            printf("Chyba: delenie nulou\n");
+            exit(1);
+        }
+        result = a / b;
+    } else {
+        printf("Chyba: neplatna operacia\n");
+        exit(1);
+    }
+
+    push_stack(stack, result);
+}
+
+int main() {
+    char input[LINE_SIZE];
+    float value;
+    struct stack mystack;
+    memset(&mystack, 0, sizeof(struct stack));
+
+    while (fgets(input, LINE_SIZE, stdin) != NULL) {
+        // Remove trailing newline character
+        input[strlen(input) - 1] = '\0';
+
+        // Try to parse input as a number
+        if (sscanf(input, "%f", &value) == 1) {
+            push_stack(&mystack, value);
+        }
+        // If it's not a number, check if it's a valid operator
+        else if (is_operator(input)) {
+            perform_operation(&mystack, input);
+        }
+        // Invalid input
+        else {
+            printf("Chyba: neplatny vstup\n");
+            return 1;
+        }
+
+        // Print stack after each input
+        print_stack(&mystack);
+    }
+
+    return 0;
 }
-