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‎3.C++程序设计/week7/README.md

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# 编程作业: 编程作业—文件操作与模板
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## 编程题#1
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[来源: POJ](http://cxsjsxmooc.openjudge.cn/test/7w6/) (Coursera声明:在POJ上完成的习题将不会计入Coursera的最后成绩。)
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**注意: 总时间限制: 1000ms 内存限制: 65536kB**
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### 描述
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实现一个三维数组模版CArray3D,可以用来生成元素为任意类型变量的三维数组,使得下面程序输出结果是:
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0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
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注意,只能写一个类模版,不能写多个。
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```c++
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#include <iostream>
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using namespace std;
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// 在此处补充你的代码
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int main()
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{
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CArray3D<int> a(3,4,5);
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int No = 0;
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for( int i = 0; i < 3; ++ i )
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for( int j = 0; j < 4; ++j )
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for( int k = 0; k < 5; ++k )
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a[i][j][k] = No ++;
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for( int i = 0; i < 3; ++ i )
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for( int j = 0; j < 4; ++j )
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for( int k = 0; k < 5; ++k )
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cout << a[i][j][k] << ",";
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return 0;
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}
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```
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### 样例输入
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```
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无
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```
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### 样例输出
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```
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0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,
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```
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### 提示
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提示:类里面可以定义类,类模版里面也可以定义类模版。例如:
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```
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class A
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{
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class B {
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};
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};
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template
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class S
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{
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T x;
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class K {
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T a;
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};
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};
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```
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### 解题思路
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之前写过一个类Array2D,稍作修改一下就好了,比如把`**ptr` 改成 `***ptr`。
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## 编程题#2: 实数的输出格式
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[来源: POJ](http://cxsjsxmooc.openjudge.cn/test/F/) (Coursera声明:在POJ上完成的习题将不会计入Coursera的最后成绩。)
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**注意: 总时间限制: 1000ms 内存限制: 1000kB**
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### 描述
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利用流操纵算子实现: 输入一个实数,先以非科学计数法输出,小数点后面保留5位有效数字;再以科学计数法输出,小数点后面保留7位有效数字。
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**注意:在不同系统、编译器上的输出格式略有不同,但保证在程序中采用默认格式设置一定能在OJ平台上得到正确结果。**
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### 输入
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以非科学计数法表示的一个正实数,保证可以用double类型存储。
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### 输出
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第一行:以非科学计数法输出该实数,小数点后面保留5位有效数字;
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第二行:以科学计数法输出该实数,小数点后面保留7位有效数字。
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### 样例输入
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```
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12.34
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```
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### 样例输出
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```
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12.34000
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1.2340000e+01
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```
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### 解题思路
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没啥好说的,就是运用各种格式输出符。
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#include <iostream>
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#include <iomanip>
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using namespace std;
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int main()
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{
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double real;
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cin >> real;
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cout << fixed << setprecision(5) << real << endl;
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cout << scientific << setprecision(7) << real << endl;
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return 0;
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}
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#include <iostream>
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#include <iomanip>
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using namespace std;
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int main()
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{
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int a;
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cin >> a;
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cout << hex << a << endl;
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cout << dec << setw(10) << setfill('0') << a << endl;
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return 0;
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}
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#include <iostream>
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using namespace std;
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template <class T>
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class CArray3D
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{
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private:
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T ***ptr;
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int size1, size2, size3;
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public:
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CArray3D(int s1, int s2, int s3) :size1(s1), size2(s2), size3(s3)
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{
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if (size1 == 0 || size2 == 0 || size3 == 0)
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{
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ptr = NULL;
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}
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else
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{
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ptr = new T**[size1];
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for (int i = 0; i < size1; i++)
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{
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ptr[i] = new T*[size2];
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for (int j = 0; j < size2; j++)
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{
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ptr[i][j] = new T[size3];
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}
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}
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}
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}
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~CArray3D()
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{
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if (ptr)
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{
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for (int i = 0; i < size1; i++)
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{
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for (int j = 0; j < size2; j++)
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{
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delete[] ptr[i][j];
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}
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delete[] ptr[i];
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}
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delete ptr;
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}
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}
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T** operator[](int i) { return ptr[i]; }
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};
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int main()
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{
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CArray3D<int> a(3, 4, 5);
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int No = 0;
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for (int i = 0; i < 3; ++i)
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for (int j = 0; j < 4; ++j)
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for (int k = 0; k < 5; ++k)
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a[i][j][k] = No++;
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for (int i = 0; i < 3; ++i)
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for (int j = 0; j < 4; ++j)
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for (int k = 0; k < 5; ++k)
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cout << a[i][j][k] << ",";
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return 0;
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}

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