1 files changed, 31 insertions, 0 deletions

diff --git a/5/6.c b/5/6.c
index e151c1c..2146387 100644
--- a/5/6.c
+++ b/5/6.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 int mgetline(char *s, int lim) {
   int i;
@@ -24,4 +25,34 @@ int matoi(char *s) {
     n = 10 * n + (*s - '0');
 
   return n;
+}
+
+void reverse(char *s) {
+  int i, j;
+
+  for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
+    s[i] = s[i] ^ s[j];
+    s[j] = s[i] ^ s[j];
+    s[i] = s[i] ^ s[j];
+  }
+}
+
+void mitoa(int n, char *s) {
+  int sign;
+  char *sp;
+
+  sp = s;
+
+  if ((sign = n) < 0)
+    n = -n;
+
+  do {
+    *s++ = n % 10 + '0';
+  } while ((n /= 10) > 0);
+
+  if (sign < 0)
+    *s++ = '-';
+  *s = 0;
+
+  reverse(sp);
 }
\ No newline at end of file