diff --git a/11_isZero.c b/11_isZero.c
index dbc7401..296b00d 100644
--- a/11_isZero.c
+++ b/11_isZero.c
@@ -20,6 +20,6 @@ int test_isZero(int x)
 int main(void)
 {
     int x = 0;
-    printf("expected: %x\n", isZero(x));
+    printf("expected: %x\n", isZero(x^0));
     printf("actual  : %x\n", test_isZero(x));
 }
diff --git a/12_minusOne.c b/12_minusOne.c
index b13fbe6..078442c 100644
--- a/12_minusOne.c
+++ b/12_minusOne.c
@@ -8,7 +8,7 @@
  */
 int minusOne(void)
 {
-    return 2;
+    return ~0X0;
 }
 
 int test_minusOne(void)
diff --git a/13_tmin b/13_tmin
new file mode 100755
index 0000000..c6e0a40
Binary files /dev/null and b/13_tmin differ
diff --git a/13_tmin.c b/13_tmin.c
index f8ce672..cada27d 100644
--- a/13_tmin.c
+++ b/13_tmin.c
@@ -8,7 +8,7 @@
  */
 int tmin(void)
 {
-    return 2;
+    return (1<<31);
 }
 
 int test_tmin(void)
diff --git a/14_tmax b/14_tmax
new file mode 100755
index 0000000..686336f
Binary files /dev/null and b/14_tmax differ
diff --git a/14_tmax.c b/14_tmax.c
index 8e2a1d7..34f84fe 100644
--- a/14_tmax.c
+++ b/14_tmax.c
@@ -8,7 +8,7 @@
  */
 int tmax(void)
 {
-    return 2;
+    return ~(1<<31);
 }
 
 int test_tmax(void)
diff --git a/15_isTmin b/15_isTmin
new file mode 100755
index 0000000..62f2420
Binary files /dev/null and b/15_isTmin differ
diff --git a/15_isTmin.c b/15_isTmin.c
index b6fadd8..04bb4f4 100644
--- a/15_isTmin.c
+++ b/15_isTmin.c
@@ -9,7 +9,7 @@
  */
 int isTmin(int x)
 {
-    return 2;
+    return !(x^(1<<31));
 }
 
 int test_isTmin(int x)
diff --git a/16_isTmax b/16_isTmax
new file mode 100755
index 0000000..5dc9665
Binary files /dev/null and b/16_isTmax differ
diff --git a/16_isTmax.c b/16_isTmax.c
index 63f77dd..ee7aac7 100644
--- a/16_isTmax.c
+++ b/16_isTmax.c
@@ -9,7 +9,7 @@
  */
 int isTmax(int x)
 {
-    return 2;
+    return x&&~(1<<31);
 }
 
 int test_isTmax(int x)
diff --git a/21_bitMatch b/21_bitMatch
new file mode 100755
index 0000000..9dbe8d9
Binary files /dev/null and b/21_bitMatch differ
diff --git a/21_bitMatch.c b/21_bitMatch.c
index aaea930..e96ff0f 100644
--- a/21_bitMatch.c
+++ b/21_bitMatch.c
@@ -10,7 +10,7 @@
  */
 int bitMatch(int x, int y)
 {
-    return 2;
+    return (x&y)|(~x&~y);
 }
 
 int test_bitMatch(int x, int y)
diff --git a/22_evenBits b/22_evenBits
new file mode 100755
index 0000000..ee696ac
Binary files /dev/null and b/22_evenBits differ
diff --git a/22_evenBits.c b/22_evenBits.c
index cf66a8c..0bb4f24 100644
--- a/22_evenBits.c
+++ b/22_evenBits.c
@@ -8,7 +8,9 @@
  */
 int evenBits(void)
 {
-    return 2;
+    int x=0;
+    x=0x55<<8 | 0x55<<16 | 0x55<<24 | 0x55;
+    return x;
 }
 
 int test_evenBits(void)
diff --git a/23_thirdBits b/23_thirdBits
new file mode 100755
index 0000000..b5a11d3
Binary files /dev/null and b/23_thirdBits differ
diff --git a/23_thirdBits.c b/23_thirdBits.c
index 09d8399..73a7686 100644
--- a/23_thirdBits.c
+++ b/23_thirdBits.c
@@ -8,9 +8,10 @@
  */
 int thirdBits(void)
 {
-    return 2;
+    return 0x49<<9 | 0x49<<18 | 0x49<<27 | 0x49 ;
 }
 
+
 int test_thirdBits(void)
 {
     int result = 0;
diff --git a/24_upperBits b/24_upperBits
new file mode 100755
index 0000000..0120f71
Binary files /dev/null and b/24_upperBits differ
diff --git a/24_upperBits.c b/24_upperBits.c
index 36dae61..08c0682 100644
--- a/24_upperBits.c
+++ b/24_upperBits.c
@@ -10,9 +10,9 @@
  */
 int upperBits(int n)
 {
-    return 2;
+    return (0x01<<31)>>n-1;
 }
-
+// 0000 0000 
 int test_upperBits(int x)
 {
     int result = 0;
@@ -24,7 +24,7 @@ int test_upperBits(int x)
 
 int main(void)
 {
-    int x = 32;
-    printf("expected: %x\n", upperBits(x));
-    printf("actual  : %x\n", test_upperBits(x));
+    int x = 0;
+    printf("expected: %x\n", test_upperBits(x));
+    printf("actual  : %x\n", upperBits(x));
 }
diff --git a/25_fitsShort b/25_fitsShort
new file mode 100755
index 0000000..24ba420
Binary files /dev/null and b/25_fitsShort differ
diff --git a/25_fitsShort.c b/25_fitsShort.c
index 6576908..aa56230 100644
--- a/25_fitsShort.c
+++ b/25_fitsShort.c
@@ -10,7 +10,7 @@
  */
 int fitsShort(int x)
 {
-    return 2;
+    return x<<16;
 }
 
 int test_fitsShort(int x)
diff --git a/33_bitNor b/33_bitNor
new file mode 100755
index 0000000..8438063
Binary files /dev/null and b/33_bitNor differ
diff --git a/33_bitNor.c b/33_bitNor.c
index f239f6d..107c013 100644
--- a/33_bitNor.c
+++ b/33_bitNor.c
@@ -3,13 +3,20 @@
 /* 
  * bitNor - ~(x|y) using only ~ and & 
  *   Example: bitNor(0x6, 0x5) = 0xFFFFFFF8
+ 0110
+ 0101
+ 1000
+
+ 1001
+ 1010
+ 1000
  *   Legal ops: ~ &
  *   Max ops: 8
  *   Rating: 1
  */
 int bitNor(int x, int y)
 {
-    return 2;
+    return (~x&~y);
 }
 
 int test_bitNor(int x, int y)
diff --git a/34_bitXor b/34_bitXor
new file mode 100755
index 0000000..9c0e09b
Binary files /dev/null and b/34_bitXor differ
diff --git a/34_bitXor.c b/34_bitXor.c
index f89b7ec..21dd7b0 100644
--- a/34_bitXor.c
+++ b/34_bitXor.c
@@ -7,9 +7,11 @@
  *   Max ops: 14
  *   Rating: 1
  */
+ 
+ 
 int bitXor(int x, int y)
 {
-    return 2;
+    return (~x&y);
 }
 
 int test_bitXor(int x, int y)
diff --git a/out b/out
new file mode 100755
index 0000000..7f4ebbc
Binary files /dev/null and b/out differ