From 720f6bb14d2fba399cb838b9af49dcf19eff08ff Mon Sep 17 00:00:00 2001
From: kdeng00 <kundeng94@gmail.com>
Date: Mon, 14 Sep 2020 21:33:05 -0400
Subject: [PATCH] Finished on exercise 2-1

---
 ch_02/exercise_02-01/main.c | 75 +++++++++++++++++++++++++++++++++++++
 ch_02/main_template.c       |  6 +++
 2 files changed, 81 insertions(+)
 create mode 100644 ch_02/exercise_02-01/main.c
 create mode 100644 ch_02/main_template.c

diff --git a/ch_02/exercise_02-01/main.c b/ch_02/exercise_02-01/main.c
new file mode 100644
index 0000000..2a12b81
--- /dev/null
+++ b/ch_02/exercise_02-01/main.c
@@ -0,0 +1,75 @@
+/*
+ *
+ * Exercise 2-1. Write a program to determine the ranges of char, short, int,
+ * and long variables, both signed and unsigned, by printing appropriate values
+ * from standard headers and by direct computation. Harder if you compute them:
+ * determine the ranges of the various floating-point types.
+ *
+ * Author: Kun Deng
+ */
+
+#include <stdio.h>
+#include <limits.h>
+#include <float.h>
+
+void print_variable_ranges_std_header(void);
+void print_variable_ranges_direct_computation(void);
+
+
+int main()
+{
+    print_variable_ranges_std_header();
+    printf("\n");
+    print_variable_ranges_direct_computation();
+
+    return 0;
+}
+
+
+void print_variable_ranges_std_header(void)
+{
+    printf("variable ranges from the standard headers\n");
+    printf("char min: %d max: %d\n", CHAR_MIN, CHAR_MAX);
+    printf("unsigned char min: %d max: %d\n", SCHAR_MIN, UCHAR_MAX);
+    printf("short min: %d max: %d\n", SHRT_MIN, SHRT_MAX);
+    printf("unsigned short min: %d max: %d\n", 0, USHRT_MAX);
+    printf("int min: %d max: %d\n", INT_MIN, INT_MAX);
+    printf("unsigned int min: %d max: %u\n", 0, UINT_MAX);
+    printf("long min: %ld max: %ld\n", LONG_MIN, LONG_MAX);
+    printf("unsigned long min: %d max: %u\n", 0, ULONG_MAX);
+}
+
+void print_variable_ranges_direct_computation(void)
+{
+    printf("variable ranges directly computed\n");
+
+    // used to determine limits
+    unsigned char un_char_start = 0;
+    unsigned short un_short_start = 0;
+    unsigned int un_int_start = 0;
+    unsigned long un_long_start = 0;
+
+    unsigned char un_char_end = un_char_start - 1;
+    unsigned short un_short_end = un_short_start - 1;
+    unsigned int un_int_end = un_int_start - 1;
+    unsigned long un_long_end = un_long_start - 1;
+
+    char char_start = 0 - (un_char_end / 2) - 1;
+    short short_start = 0 - (un_short_end / 2) - 1;
+    int int_start = 0 - (un_int_end / 2) - 1;
+    long long_start = 0 - (un_long_end / 2) - 1;
+
+    char char_end = char_start - 1;
+    short short_end = short_start - 1;
+    int int_end = int_start - 1;
+    long long_end = long_start - 1;
+
+    printf("char min: %d max: %d\n", char_start, char_end);
+    printf("unsigned char min: %d max: %d\n", un_char_start, un_char_end);
+    printf("short min: %d max: %d\n", short_start, short_end);
+    printf("unsigned short min: %d max: %d\n", un_short_start, un_short_end);
+    printf("int min: %d max: %d\n", int_start, int_end);
+    printf("unsigned int min: %d max: %u\n", 0, un_int_end);
+    printf("long min: %ld max: %ld\n", long_start, long_end);
+    printf("unsigned long min: %d max: %u\n", 0, un_long_end);
+}
diff --git a/ch_02/main_template.c b/ch_02/main_template.c
new file mode 100644
index 0000000..a18dcbd
--- /dev/null
+++ b/ch_02/main_template.c
@@ -0,0 +1,6 @@
+/*
+ *
+ * Exercise 2-
+ *
+ * Author: Kun Deng
+ */