From 81e9bfc58a384210349d714c847f95bc0b0b5b0f 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 17:37:51 +0200
Subject: [PATCH] ex-05: Initial solution

---
 exercise-05-calculator/main.c | 47 +++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 exercise-05-calculator/main.c

diff --git a/exercise-05-calculator/main.c b/exercise-05-calculator/main.c
new file mode 100644
index 0000000..d2552bd
--- /dev/null
+++ b/exercise-05-calculator/main.c
@@ -0,0 +1,47 @@
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+  printf("Zadejte vzorec:\n");
+
+  double num1, num2;
+  char op;
+  if (scanf(" %lf %c %lf = ", &num1, &op, &num2) != 3) {
+    printf("Nespravny vstup.\n");
+    return EXIT_FAILURE;
+  }
+
+  if (op != '+' && op != '-' && op != '*' && op != '/') {
+    printf("Nespravny vstup.\n");
+    return EXIT_FAILURE;
+  }
+
+  if (op == '/' && num2 == 0) {
+    printf("Nespravny vstup.\n");
+    return EXIT_FAILURE;
+  }
+
+  double result = 0;
+  switch (op) {
+  case '+':
+    result = num1 + num2;
+    break;
+  case '-':
+    result = num1 - num2;
+    break;
+  case '*':
+    result = num1 * num2;
+    break;
+  case '/':
+    result = floor(num1 / num2);
+    break;
+  };
+
+  if (result > INT_MAX) {
+    printf("%.1e\n", result);
+  } else {
+    printf("%ld\n", (long)result);
+  }
+}