From 1a8ad13b4516714c4ceaac077ccc0781344698c8 Mon Sep 17 00:00:00 2001
From: Anton Dolozin <anton.dolozin@student.tuke.sk>
Date: Mon, 6 Oct 2025 14:36:18 +0200
Subject: [PATCH] Something strange with server

---
 du3/program.c | 68 ++++++++++++++++++++++++++-------------------------
 1 file changed, 35 insertions(+), 33 deletions(-)

diff --git a/du3/program.c b/du3/program.c
index 279151b..7f441ec 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -26,49 +26,51 @@ void print_stack(struct stack* stack){
         printf("%.2f ", stack->values[i]);
     printf("\n");
 }
-  
-void process_operations(struct stack* stack){
+
+
+void process_operations(struct stack* stack) {
     char line[STACK_SIZE];
     int could_read = 0;
-   
-    while(fgets(line, sizeof(line), stdin)){
-        line[strcspn(line, "\n")] = '\0';
-        if(line[0] == '\0'){
+
+    while (fgets(line, sizeof(line), stdin)) {
+     line[strcspn(line, "\n")] = '\0';
+        if (line[0] == '\0') {   
             printf("no input\n");
             return;
         }
-        could_read = 1;
-        
-         if ((strcmp(line, "+") == 0 || strcmp(line, "-") == 0 || strcmp(line, "*") == 0 || strcmp(line, "/") == 0) 
-                  && stack->size >= 2){
-            float b = pop_stack(stack);
-            float a = pop_stack(stack);
-            float res = (line[0] == '+') ? a + b :
-                        (line[0] == '-') ? a - b :
-                        (line[0] == '*') ? a * b :
-                        (line[0] == '/') ? a / b : 0;
-            push_stack(stack, res);
-            print_stack(stack);
-        }
-        else if ((strcmp(line, "+") == 0 || strcmp(line, "-") == 0 || strcmp(line, "*") == 0 || strcmp(line, "/") == 0) 
-                  && stack->size <2){
-                    printf("no input\n");
-                    return;
-                  }
-    
-    else{ 
+        could_read= 1;
+
+        if ((strcmp(line, "+") == 0 || strcmp(line, "-") == 0 ||
+             strcmp(line, "*") == 0 || strcmp(line, "/") == 0)) {
+            if (stack->size >= 2) {
+                float b = pop_stack(stack);
+                float a = pop_stack(stack);
+                float res = (line[0] == '+') ? a + b :
+                            (line[0] == '-') ? a - b :
+                            (line[0] == '*') ? a * b :
+                            (line[0] == '/') ? a / b : 0;
+                push_stack(stack, res);
+                print_stack(stack);
+            } else {
+                printf("bad input\n");
+                return;
+            }
+        } else {
             char *endptr;
             float val = strtof(line, &endptr);
+            if (endptr == line) { 
+                printf("bad input\n");
+                return;
+            }
             push_stack(stack, val);
             print_stack(stack);
+        }
+    }
 
-            
-
-    
-} }
-if (!could_read){
-    printf("no input\n");
-} }
+    if (!could_read) {
+        printf("no input\n");
+    }
+}
 int main(void){
     memset(&mystack,0,sizeof(struct stack));
     process_operations(&mystack);