From 84071736e2964f06fc657a40b70c3131c379df7d Mon Sep 17 00:00:00 2001
From: pro100ton <pro100ton@gmail.com>
Date: Thu, 23 Jan 2025 22:48:21 +0300
Subject: [PATCH] Going thorugh preprocessor chapter

---
 c_modern_approach/Preprocessor/celcius.c      | 17 +++++++++++++++
 .../Preprocessor/double_hashtag_op.c          |  7 +++++++
 c_modern_approach/Preprocessor/macro_rules.c  | 21 +++++++++++++++++++
 .../Preprocessor/parametrized_macroses.c      |  9 ++++++++
 c_modern_approach/Preprocessor/playground.c   |  9 ++++++++
 c_modern_approach/Preprocessor/undef.c        | 10 +++++++++
 c_modern_approach/README.md                   |  2 ++
 7 files changed, 75 insertions(+)
 create mode 100644 c_modern_approach/Preprocessor/celcius.c
 create mode 100644 c_modern_approach/Preprocessor/double_hashtag_op.c
 create mode 100644 c_modern_approach/Preprocessor/macro_rules.c
 create mode 100644 c_modern_approach/Preprocessor/parametrized_macroses.c
 create mode 100644 c_modern_approach/Preprocessor/playground.c
 create mode 100644 c_modern_approach/Preprocessor/undef.c
 create mode 100644 c_modern_approach/README.md

diff --git a/c_modern_approach/Preprocessor/celcius.c b/c_modern_approach/Preprocessor/celcius.c
new file mode 100644
index 0000000..9f1678e
--- /dev/null
+++ b/c_modern_approach/Preprocessor/celcius.c
@@ -0,0 +1,17 @@
+#include "stdio.h"
+#include <stdio.h>
+
+#define FREEZING_PT 32.0f
+#define SCALE_FACTOR (5.0f / 9.0f)
+
+int main(void) {
+  float farenheit, celsius;
+
+  printf("Enter Fahrenheit temperature: ");
+  scanf("%f", &farenheit);
+
+  celsius = (farenheit - FREEZING_PT) * SCALE_FACTOR;
+
+  printf("Celcius equivalent is: %.1f\n", celsius);
+  return 0;
+}
diff --git a/c_modern_approach/Preprocessor/double_hashtag_op.c b/c_modern_approach/Preprocessor/double_hashtag_op.c
new file mode 100644
index 0000000..08dcae9
--- /dev/null
+++ b/c_modern_approach/Preprocessor/double_hashtag_op.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#define MK_ID(n) i##n
+
+int main(int argc, char *argv[]) {
+  int MK_ID(1); // This converts to `int i1`
+  printf("%d", i1);
+}
diff --git a/c_modern_approach/Preprocessor/macro_rules.c b/c_modern_approach/Preprocessor/macro_rules.c
new file mode 100644
index 0000000..600f2af
--- /dev/null
+++ b/c_modern_approach/Preprocessor/macro_rules.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#define SIZE 256
+
+int main(int argc, char *argv[])
+{
+  int BUFFER_SIZE;
+  if (BUFFER_SIZE > SIZE)
+    puts("ERROR: SIZE exceeded");
+}
+
+/*
+ * Код выше трансформируется в следующее:
+ *
+ *
+ * int main(int argc, char *argv[])
+ * {
+ *   int BUFFER_SIZE;
+ *   if (BUFFER_SIZE > 256)
+ *     puts("ERROR: SIZE exceeded");
+ * }
+*/
diff --git a/c_modern_approach/Preprocessor/parametrized_macroses.c b/c_modern_approach/Preprocessor/parametrized_macroses.c
new file mode 100644
index 0000000..c4905bf
--- /dev/null
+++ b/c_modern_approach/Preprocessor/parametrized_macroses.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+
+int main(int argc, char *argv[]) {
+  int j, k;
+  j = 10;
+  k = 20;
+  printf("%d", MAX(j, k));
+}
diff --git a/c_modern_approach/Preprocessor/playground.c b/c_modern_approach/Preprocessor/playground.c
new file mode 100644
index 0000000..048d3aa
--- /dev/null
+++ b/c_modern_approach/Preprocessor/playground.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+#define PRINT_INT(n) printf(#n " AND " #n " = %d\n", n)
+
+int main(void) {
+  int i, j;
+  i = 10;
+  j = 20;
+  PRINT_INT(i / j);
+}
diff --git a/c_modern_approach/Preprocessor/undef.c b/c_modern_approach/Preprocessor/undef.c
new file mode 100644
index 0000000..dc6cf66
--- /dev/null
+++ b/c_modern_approach/Preprocessor/undef.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#define SIZE 100
+int main(int argc, char *argv[]) {
+  int i;
+  i = 101;
+#undef SIZE
+  if (i > SIZE) {
+    printf("Yey!\n");
+  }
+}
diff --git a/c_modern_approach/README.md b/c_modern_approach/README.md
new file mode 100644
index 0000000..f82190f
--- /dev/null
+++ b/c_modern_approach/README.md
@@ -0,0 +1,2 @@
+# Точка останова
+Creating longer macros - 328