cout << (c << 1) - (t * t == num)
时间: 2023-11-04 11:33:44 浏览: 29
This code snippet uses bitwise left shift operator (<<) to shift the value of variable c by 1 bit to the left, effectively multiplying it by 2. The result is then subtracted from a boolean expression (t * t == num) which evaluates to 1 or 0 depending on whether the square of variable t is equal to num.
The purpose of this code snippet is unclear without additional context, but it seems to be related to some calculation involving variables c, t, and num. The boolean expression may be used to conditionally adjust the result of the left shift operation.
相关问题
#include <iostream> using namespace std; int main() { long long int a, b, c, d; long long int num; while (scanf("%lld.%lld.%lld.%lld", &a, &b, &c, &d) != EOF) { cin >> num; cout << (a << 24) + (b << 16) + (c << 8) + d << endl; a = num >> 24; num = num - (a << 24); b = num >> 16; num = num - (b << 16); c = num >> 8; d = num - (c << 8); cout << a << "." << b << "." << c << "." << d << endl; } }优化一下这段代码
这段代码已经相当简洁和高效。不过,我们可以对其进行一些优化,以提高代码的可读性和可维护性。
首先,我们可以使用更具有描述性的变量名,以增加代码的可读性。例如,将`a`、`b`、`c`和`d`改为`part1`、`part2`、`part3`和`part4`。
其次,我们可以使用无符号整型数据类型来存储IP地址的各个部分,因为IP地址的每个部分都应该是非负整数。可以使用`uint8_t`来代替`long long int`。
最后,我们可以将位运算的逻辑进行封装,以提高代码的可读性。可以编写一个函数,将转换为长整型数值的逻辑和将长整型数值转换回IP地址的逻辑分别封装在函数中。
下面是优化后的代码示例:
```cpp
#include <iostream>
#include <cstdint>
using namespace std;
uint32_t ipToLong(uint8_t part1, uint8_t part2, uint8_t part3, uint8_t part4) {
return (part1 << 24) + (part2 << 16) + (part3 << 8) + part4;
}
void longToIp(uint32_t num, uint8_t& part1, uint8_t& part2, uint8_t& part3, uint8_t& part4) {
part1 = num >> 24;
num = num - (part1 << 24);
part2 = num >> 16;
num = num - (part2 << 16);
part3 = num >> 8;
part4 = num - (part3 << 8);
}
int main() {
uint8_t part1, part2, part3, part4;
uint32_t num;
while (scanf("%hhu.%hhu.%hhu.%hhu", &part1, &part2, &part3, &part4) != EOF) {
cin >> num;
cout << ipToLong(part1, part2, part3, part4) << endl;
longToIp(num, part1, part2, part3, part4);
cout << static_cast<unsigned int>(part1) << "." << static_cast<unsigned int>(part2) << "." << static_cast<unsigned int>(part3) << "." << static_cast<unsigned int>(part4) << endl;
}
}
```
这样,代码变得更加易读,同时也提供了更好的可维护性和可扩展性。
#include"Student.h" #include<iostream> #include<string> #include<fstream> using namespace std; Student::Student(int num, char* n, char* g, int m, int e, int c) { this->num = num; strcpy_s(name,n); strcpy_s(gender,g); Math = m; English = e; Computer = c; sum = Math + English + Computer; aver = sum / 3; } void Student::setNum(int num) { this->num = num; } void Student::setName(char* n) { strcpy_s(name,n); } void Student::setGender(char* g) { strcpy_s(gender,g); } void Student::setMath(int m) { Math = m; } void Student::setEnglish(int e) { English = e; } void Student::setComputer(int c) { Computer = c; } void Student::showStudentInfor() { cout << endl << "=========>> 显示学生成绩 <<=========" << endl; cout << "-------------------------------------------------------" << endl; cout << "学号" << "\t" << "姓名" << "\t" << "性别" << "\t" << "高数" << "\t" << "英语" << "\t" << "计算机" << "\t" << "平均分" << endl; cout << "-------------------------------------------------------" << endl; cout << num << "\t" << name << "\t" << gender << "\t" << Math << "\t" << English << "\t" << Computer << "\t" << aver << endl; }该怎样去定义且初始化Student类的对象数组
你可以使用以下方式定义并初始化一个名为students的Student对象数组:
```c++
Student students[3] = {
Student(1001, "张三", "男", 80, 75, 90),
Student(1002, "李四", "女", 85, 90, 87),
Student(1003, "王五", "男", 90, 88, 92)
};
```
这将创建一个长度为3的Student对象数组,每个对象都使用构造函数进行初始化。你可以根据需要更改数组的长度和对象的初始化值。注意,如果你的构造函数接受char*类型的参数,则必须使用strcpy_s函数将字符串复制到类的成员变量中,以避免内存错误。
相关推荐
![doc](https://img-home.csdnimg.cn/images/20210720083327.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![ppt](https://img-home.csdnimg.cn/images/20210720083527.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)