From eb88512ab3c6dfec4e73fe95da3f36ba1219b991 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matej=20Chmel=C3=A1r?= <mc892yx@omega.tuke.sk>
Date: Mon, 1 Mar 2021 18:35:22 +0100
Subject: [PATCH] first push

---
 du1/program.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 du1/program.c

diff --git a/du1/program.c b/du1/program.c
new file mode 100644
index 0000000..90318a3
--- /dev/null
+++ b/du1/program.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <ctype.h>
+
+int main() {
+    int c = 0;
+    while(1) {
+        c = getchar();
+    }
+    if (c == islower(c)) {
+        c = toupper(c);
+    }
+    else if (c == isupper(c)) {
+        c = tolower(c);
+    }
+    return 0;
+}
+
+