5.6

1 files changed, 61 insertions, 0 deletions

diff --git a/5.6.2.c b/5.6.2.c
new file mode 100644
index 0000000..d29afc6
--- /dev/null
+++ b/5.6.2.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+
+#define MAXLEN 15
+
+void reverse(char str[]);
+char* itoa(int n, char str[]);
+
+int 
+main(void)
+{
+  int n = -147483647;
+  char str[MAXLEN];
+
+  printf("%d\n", n);
+  printf("%s\n", itoa(n, str));
+
+  return 0;
+}
+
+void
+reverse(char str[])
+{
+  char temp, *str_og;
+
+  str_og = str;
+
+  while (*str++)
+    ;
+  str -= 2;
+
+  while (str_og < str) {
+    temp = *str_og;
+    *str_og++ = *str;
+    *str-- = temp;
+  }
+}
+
+char*
+itoa(int n, char str[])
+{
+  int sign;
+  char *str_og = str;
+
+  /* to include the most -ve int */
+  n = ((sign = n) < 0) ? -(n+1) : n-1;
+
+  do {
+    *str++ = n%10 + '0';
+  } while ((n /= 10) > 0);
+
+  if (sign <0)
+    *str++ = '-';
+
+  /* part of "to include the most -ve int" */
+  *str_og += 1;
+  *str = '\0';
+
+  reverse(str_og);
+
+  return str_og;
+}