memory nthat

lib/std/stdlib.cpp

@@ -8,30 +8,53 @@ void swap(int* x, int* y) {
 	y = t;
 }
 
-void reverse(char s[]) {
-	int i;
-	int j = strlen(s) - 1;
-	char c;
-
-	for (i = 0; i < j; i++) {
-		j--;
-		c = s[i];
-		s[i] = s[j];
-		s[j] = c;
-	}
+void reverse(char *s) {
+   int length, c;
+   char *begin, *end, temp;
+ 
+   length = strlen(s);
+   begin  = s;
+   end    = s;
+ 
+   for (c = 0; c < length - 1; c++)
+      end++;
+ 
+   for (c = 0; c < length/2; c++) {
+      temp   = *end;
+      *end   = *begin;
+      *begin = temp;
+ 
+      begin++;
+      end--;
+   }
 }
 
-void itoa(int i, char[] s) {
-	int i, sign;
 
-	if ((sign = n) < 0)  /* record sign */
-		n = -n;          /* make n positive */
-	i = 0;
-	do {       /* generate digits in reverse order */
-		s[i++] = n % 10 + '0';   /* get next digit */
-	} while ((n /= 10) > 0);     /* delete it */
-	if (sign < 0)
-		s[i++] = '-';
-	s[i] = '\0';
+char* itoa(int n, char s[]) {
+    int i = 0; 
+    bool isNegative = false; 
+  
+    if (n == 0) { 
+        s[i++] = '0'; 
+        s[i] = '\0'; 
+        return s;
+    } 
+  
+	if (n < 0) { 
+        isNegative = true; 
+        n = -n; 
+    } 
+    
+    while (n != 0) { 
+        s[i++] = n % 10 + '0'; 
+        n /= 10; 
+    } 
+  
+    if (isNegative) 
+        s[i++] = '-'; 
+  
+    s[i] = '\0';
+	
 	reverse(s);
+    return s;
 }

lib/std/stdlib.h

@@ -1,5 +1,5 @@
 #pragma once 
 
 void swap(int* a, int* b);
-void reverse(char s[])
-void itoa(int i, char[] s);
+void reverse(char* s);
+char* itoa(int i, char s[] = "");