Initial commit for question 15

auntyellow · Nov 24, 2016 · 5a81aa1 · 5a81aa1
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diff --git a/15_NumberOf1InBinary/15_NumberOf1InBinary.vcxproj b/15_NumberOf1InBinary/15_NumberOf1InBinary.vcxproj
@@ -0,0 +1,150 @@
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diff --git a/15_NumberOf1InBinary/15_NumberOf1InBinary.vcxproj.filters b/15_NumberOf1InBinary/15_NumberOf1InBinary.vcxproj.filters
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diff --git a/15_NumberOf1InBinary/NumberOf1InBinary.cpp b/15_NumberOf1InBinary/NumberOf1InBinary.cpp
@@ -0,0 +1,80 @@
+//==================================================================
+// 《剑指Offer——名企面试官精讲典型编程题》代码
+// 著作权所有者：何海涛
+//==================================================================
+
+// 面试题15：二进制中1的个数
+// 题目：请实现一个函数，输入一个整数，输出该数二进制表示中1的个数。例如
+// 把9表示成二进制是1001，有2位是1。因此如果输入9，该函数输出2。
+
+#include "cstdio"
+
+int NumberOf1_Solution1(int n)
+{
+    int count = 0;
+    unsigned int flag = 1;
+    while (flag)
+    {
+        if (n & flag)
+            count++;
+
+        flag = flag << 1;
+    }
+
+    return count;
+}
+
+int NumberOf1_Solution2(int n)
+{
+    int count = 0;
+
+    while (n)
+    {
+        ++count;
+        n = (n - 1) & n;
+    }
+
+    return count;
+}
+
+// ====================测试代码====================
+void Test(int number, unsigned int expected)
+{
+    int actual = NumberOf1_Solution1(number);
+    if (actual == expected)
+        printf("Solution1: Test for %p passed.\n", number);
+    else
+        printf("Solution1: Test for %p failed.\n", number);
+
+    actual = NumberOf1_Solution2(number);
+    if (actual == expected)
+        printf("Solution2: Test for %p passed.\n", number);
+    else
+        printf("Solution2: Test for %p failed.\n", number);
+
+    printf("\n");
+}
+
+int main(int argc, char* argv[])
+{
+    // 输入0，期待的输出是0
+    Test(0, 0);
+
+    // 输入1，期待的输出是1
+    Test(1, 1);
+
+    // 输入10，期待的输出是2
+    Test(10, 2);
+
+    // 输入0x7FFFFFFF，期待的输出是31
+    Test(0x7FFFFFFF, 31);
+
+    // 输入0xFFFFFFFF（负数），期待的输出是32
+    Test(0xFFFFFFFF, 32);
+
+    // 输入0x80000000（负数），期待的输出是1
+    Test(0x80000000, 1);
+
+    return 0;
+}
+
diff --git a/CodingInterviewChinese2.sln b/CodingInterviewChinese2.sln
@@ -38,6 +38,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "13_RobotMove", "13_RobotMov
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "14_CuttingRope", "14_CuttingRope\14_CuttingRope.vcxproj", "{FF7ED3B0-5CE4-4D7B-954A-9EE93936D9A1}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "15_NumberOf1InBinary", "15_NumberOf1InBinary\15_NumberOf1InBinary.vcxproj", "{A9AF95C4-4FA9-4A7E-B005-005777651659}"
+EndProject
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