From 49af8a805ef65f42cb4367eb47bf2d04e928454b Mon Sep 17 00:00:00 2001
From: kdeng00 <kundeng94@gmail.com>
Date: Sat, 27 Feb 2021 23:49:24 -0500
Subject: [PATCH] Finished exercise 5.2

---
 ch_05/exercise_05-02/main.c          | 106 +++++++++++++++++++++++++++
 ch_05/exercise_05-02/main_template.c |  15 ----
 2 files changed, 106 insertions(+), 15 deletions(-)
 create mode 100644 ch_05/exercise_05-02/main.c
 delete mode 100644 ch_05/exercise_05-02/main_template.c

diff --git a/ch_05/exercise_05-02/main.c b/ch_05/exercise_05-02/main.c
new file mode 100644
index 0000000..a0591b0
--- /dev/null
+++ b/ch_05/exercise_05-02/main.c
@@ -0,0 +1,106 @@
+/*
+ *
+ * Exercise 5-2. Write getfloat, the floating-point analog of getint. What type does getfloat
+ * return as its function value?
+ *
+ * Author: Kun Deng
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+
+#define BUFSIZE 100
+#define SIZE 1024
+
+int getch(void);
+void ungetch(int);
+
+int getfloat(float *ptr);
+
+
+int main(void)
+{
+    int n;
+    float array[SIZE];
+
+    for(n=0; n<SIZE && getfloat(&array[n]) != EOF; n++)
+        ;
+
+    for(; n >= 0; n--)
+    {
+        printf("%f ",array[n]);
+    }
+
+    printf("\n");
+
+    return 0;
+}
+
+int getfloat(float *ptr)
+{
+    int c,sign;
+    float power;
+
+    while(isspace(c = getch()))
+        ;
+
+    if(!isdigit(c) && c != EOF && c != '+' && c != '-' && c != '.')
+    {
+        ungetch(c);
+        return 0;
+    }
+
+    sign = (c == '-') ? -1: 1;
+
+    if(c == '+' || c == '-')
+    {
+        c = getch();
+    }
+
+    for(*ptr = 0.0; isdigit(c); c = getch())
+    {
+        *ptr = 10.0 * (*ptr) + (c - '0');
+    }
+
+    if(c == '.')
+    {
+        c = getch();
+    }
+
+    for(power=1.0; isdigit(c); c = getch())
+    {
+        *ptr = 10.0 * (*ptr) + (c - '0');   /* fractional part */
+        power *= 10.0;
+    }
+
+    *ptr  *= sign / power;
+
+    if(c != EOF)
+    {
+        ungetch(c);
+    }
+
+    return c;
+}
+
+char buf[BUFSIZE];
+int bufp = 0;
+
+int getch(void)
+{
+    return (bufp > 0) ? buf[--bufp] : getchar();
+}
+
+void ungetch(int c)
+{
+    if(bufp >= BUFSIZE)
+    {
+        printf("ungetch: too many characters\n");
+    }
+    else
+    {
+        buf[bufp++] = c;
+    }
+}
diff --git a/ch_05/exercise_05-02/main_template.c b/ch_05/exercise_05-02/main_template.c
deleted file mode 100644
index 29c3190..0000000
--- a/ch_05/exercise_05-02/main_template.c
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- *
- * Exercise 5-2. Write getfloat, the floating-point analog of getint. What type does getfloat
- * return as its function value?
- *
- * Author: Kun Deng
- */
-
-
-int main()
-{
-
-
-    return 0;
-}