add 3.5

2 files changed, 64 insertions, 1 deletions

diff --git a/3.4.c b/3.4.c
index d4a1c9a..5c75d03 100644
--- a/3.4.c
+++ b/3.4.c
@@ -38,7 +38,7 @@ itoa(int n, char str[])
 {
   int sign, i;
 
-  /* to include the most -ve int*/
+  /* to include the most -ve int */
   n = ((sign = n) < 0) ? -(n+1) : n-1;
 
   i = 0;
@@ -49,6 +49,7 @@ itoa(int n, char str[])
   if (sign <0)
     str[i++] = '-';
 
+  /* part of "to include the most -ve int" */
   str[0] += 1;
   str[i] = '\0';
 
diff --git a/3.5.c b/3.5.c
new file mode 100644
index 0000000..e7b4d3e
--- /dev/null
+++ b/3.5.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+
+#define MAXLEN 15
+
+void reverse(char str[]);
+char* itob(int n, char str[], int base);
+
+int 
+main(void)
+{
+  int n = 21474836;
+  char str[MAXLEN];
+
+  printf("%x\n", n);
+  printf("%s\n", itob(n, str, 16));
+
+  return 0;
+}
+
+void
+reverse(char str[])
+{
+  int i, j;
+  char temp;
+
+  for (j = 0; str[j] != '\0'; j++)
+    ;
+
+  for (i = 0, --j; i < j; i++, j--) {
+    temp = str[i];
+    str[i] = str[j];
+    str[j] = temp;
+  }
+}
+
+char*
+itob(int n, char str[], int base)
+{
+  int sign, i;
+
+  /* to include the most -ve int */
+  n = ((sign = n) < 0) ? -(n+1) : n-1;
+
+  i = 0;
+  do {
+    if (n%base >= 0 && n%base <= 9)
+      str[i++] = n%base + '0';
+    else
+      str[i++] = n%base + 'a' - 10;
+  } while ((n /= base) > 0);
+
+  if (sign <0)
+    str[i++] = '-';
+
+  /* part of "to include the most -ve int" */
+  str[0] += 1;
+  str[i] = '\0';
+
+  reverse(str);
+
+  return str;
+}