1 files changed, 38 insertions, 0 deletions
diff --git a/rushs/evalexpr/my_itoa/my_itoa.c b/rushs/evalexpr/my_itoa/my_itoa.c
new file mode 100644
index 0000000..cbb6f73
--- /dev/null
+++ b/rushs/evalexpr/my_itoa/my_itoa.c
@@ -0,0 +1,38 @@
+#include "my_itoa.h"
+
+char *my_itoa(int value, char *s)
+{
+    if (value == 0)
+    {
+        s[0] = '0';
+        s[1] = '\0';
+        return s;
+    }
+    char *head = s;
+    if (value < 0)
+    {
+        s[0] = '-';
+        s++;
+        value = -value;
+    }
+
+    // count numbers
+    int t = value;
+    int n = 0;
+    while (t > 0)
+    {
+        t /= 10;
+        n++;
+    }
+
+    // n = number count
+    s[n] = '\0';
+    n--;
+    for (; n >= 0; n--)
+    {
+        s[n] = value % 10 + '0';
+        value /= 10;
+    }
+
+    return head;
+}