diff --git a/du3/program.c b/du3/program.c
index 5fba259..d5ec218 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -12,12 +12,12 @@ struct stack{
 struct stack* create_stack (int capacity) {
     struct stack* s = malloc (sizeof(struct stack));
     if (s==NULL) {
-        printf("Error!");
+        printf("Error!\n");
         exit(1);
     }
     s->values = malloc(capacity * sizeof(float));
     if (s->values==NULL) {
-        printf("Error!");
+        printf("Error!\n");
         free(s);
         exit(1);
     }
@@ -26,6 +26,32 @@ struct stack* create_stack (int capacity) {
     return s;
 }
 
+void push_stack (struct stack* s, float value) {
+    if (s->size >= s->capacity) {
+        printf("Stack perepolnen!\n");
+        exit(1);
+    }
+    s->values[s->size] = value;
+    s->size++;
+}
+
+float pop_stack(struct stack* s) {
+    if (s->size <= 0) {
+        prinf("Erroe!\n");
+        exit(1);
+    }
+    s->size--;
+    return 
+}
+
+void print_stack(struct stack* s) {
+
+}
+
+void destroy_stack (struct stack* s) {
+
+}
+
 int main() {
     return 0;
 }
\ No newline at end of file