diff --git a/labs/01_datalab/bits.c b/labs/01_datalab/bits.c
index f4b15b1..6c058cd 100644
--- a/labs/01_datalab/bits.c
+++ b/labs/01_datalab/bits.c
@@ -197,7 +197,7 @@ int bitXor(int x, int y) {
  *   Rating: 1
  */
 volatile int isTmin(int x) {
-    return (!(!x)) & (!(((~(x) + 1) ^ x)));
+    return !!x & (!(((~(x) + 1) ^ x)));
 }
 //2
 /* 
@@ -280,7 +280,7 @@ unsigned floatScale2(unsigned uf) {
  *   Rating: 4
  */
 int floatFloat2Int(unsigned uf) {
-    unsigned exp, sign, frac, m;
+    unsigned exp, sign, frac, mantissa;
     int value, shift;
     exp = (uf >> 23) & ((1 << 8) - 1);
     sign = (uf >> 31) & 1;
@@ -295,12 +295,12 @@ int floatFloat2Int(unsigned uf) {
     }
 
     shift = exp - 150;
-    m = ((1 << 23) | frac);
+    mantissa = ((1 << 23) | frac);
     
     if (shift > 0) {
-        value = m << shift;
+        value = mantissa << shift;
     } else {
-        value = m >> -shift;
+        value = mantissa >> -shift;
     }
     if (sign) {
         return -value;