fixed

programs/p42/main.c

@@ -3,11 +3,17 @@
 int main(void) {
     int a, b, i, ans;
 
-    printf("Input upper limit: ");
+    printf("Input integer: ");
     (void)scanf("%d", &a);
-    printf("Input lower limit: ");
+    printf("Input integer: ");
     (void)scanf("%d", &b);
 
+    if (a < b) {
+        a = a^b;
+        b = a^b;
+        a = a^b;
+    }
+
     i = b;
     ans = 0;