From 9977715ddcc509c1df5b75cf57174a82eb4b1759 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Kl=C3=A9ger?= <klegetom@fit.cvut.cz>
Date: Mon, 20 Oct 2025 21:05:54 +0200
Subject: [PATCH] ex-05: Improve edge case handling

---
 exercise-05-calculator/main.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/exercise-05-calculator/main.c b/exercise-05-calculator/main.c
index d2552bd..f09f045 100644
--- a/exercise-05-calculator/main.c
+++ b/exercise-05-calculator/main.c
@@ -8,7 +8,8 @@ int main() {
 
   double num1, num2;
   char op;
-  if (scanf(" %lf %c %lf = ", &num1, &op, &num2) != 3) {
+  char equal_sign;
+  if (scanf("%lf %c %lf %c", &num1, &op, &num2, &equal_sign) != 4 || equal_sign != '=') {
     printf("Nespravny vstup.\n");
     return EXIT_FAILURE;
   }
@@ -35,13 +36,18 @@ int main() {
     result = num1 * num2;
     break;
   case '/':
-    result = floor(num1 / num2);
+    result = num1 / num2;
+    if (result < 0) {
+      result = ceil(num1 / num2);
+    } else {
+      result = floor(num1 / num2);
+    }
     break;
-  };
+  }
 
-  if (result > INT_MAX) {
-    printf("%.1e\n", result);
-  } else {
+  if (fabs(result - (int)result) < 1e-9) {
     printf("%ld\n", (long)result);
+  } else {
+    printf("%.12g\n", result);
   }
 }