c++上课题目

1. 引用的声明及访问

代码:

复制代码
#include<iostream>
using namespace std;
int x = 5, y =10;
int &r = x;//r为x的变量别名
void print()
{
    cout << "x=" << x << "y" << y << "r=" << r << endl;
    cout << "  Address of x" << &x << endl;//输入变量x的内存地址
    cout << "Address of y" << &y << endl;
    cout << "Address of r" << &r << endl;
}
int main() 
{
    print() ;//调用输出函数
    r = y;//赋值
    print() ;
    y = 100;//再赋值
    x = y - 10;//x,y同时改变
    print();
    return 0;
}

运行结果:

复制代码
x=5 y=10 r=5
  Address of x: 0x7ffeefbff53c
Address of y: 0x7ffeefbff538
Address of r: 0x7ffeefbff53c
x=10 y=10 r=10
  Address of x: 0x7ffeefbff53c
Address of y: 0x7ffeefbff538
Address of r: 0x7ffeefbff53c
x=90 y=100 r=90
  Address of x: 0x7ffeefbff53c
Address of y: 0x7ffeefbff538
Address of r: 0x7ffeefbff53c

2. 通过引用参数修改实际参数的值

代码:

复制代码
#include <iostream>
using namespace std;
void swap ( int &x, int &y )//引用参数成为实际参数变量额、的别名
{
    int t = x;
    x = y;
    y = t;
}
int main () 
{
    int a = 3, b = 5, d = 20, c = 10;
    cout << "a=" << "  b=" << b << endl ;
    swap (a,b) ;
    cout << "a=" << a << " b=" << b << endl;
    swap ( c, d);
    cout << "c=" << c << " d=" << d << endl;
}

运行结果:

复制代码
a = 3 b = 5
a =5 b = 3
c =10 d = 20
c = 20 d =10

3. 三种参数的使用示例

复制代码
#include<iostream>
using namespace std;
int Fun(const int &x, int &y,int z)
{
    y++;
    z++;
    return y;
}
int main () 
{
    int a= 1, b = 3, c = 3, d = 0;
    cout << "a=" << a << "B=" << b << "c=" << c << "d=" << d << endl;
    d =Fun(a, b, c);
    cout << "a=" << a << " b=" << b << "c=" << c << "d=" << d << endl;
    return 0;
}

结果:

复制代码
a=1 b=2 c=3 d=0
a=1 b=3 c=3 d=3

4.动态空间管理示例

复制代码
#include<iostream>
#include <ctime>
#include <cmath>
#include <iomanip>
using namespace std;
const int N =30;
int main() 
{
    int *p, *sum, i;
    sum= new int (0);
    p = new int (N);
    if(p==NULL) {
        cout << "allocation failure.\n";
        return 0;
    }
    srand( time(NULL));
    for(i =0; i < N;i++)
    {
        p[i] = rand() % 100;
        if(p[i] %2)
            (*sum) ++;
    }
    for(i=0;i <N;i++)
    {
        cout << setw(4) << p[i];
        if((i+1) % 10==0)
        cout << endl;
    }
    cout << "the number of odd is:" << *sum << endl;
    delete []p;
    delete sum;
    return 0;
}

运行结果:

复制代码
  43  66  71  26  11  46  64  80  24  31
 36  56  42  88  40  82  10  85  68  69
 84  47  91  44  14  57  88  40  56  18
the number of odd is: 10

5. 异常处理的步骤

复制代码
#include<iostream>
using namespace std;
int divide(int x, int y) 
{
    if(y == 0) throw y;
    return x /y;

}
int main () 
{
    int a = 10 , b= 5, c =0 ;
    try
    {
        cout <<"a/b" << divide ( a,b) << endl;
        cout <<"b/a" << divide ( b,a) << endl;
        cout <<"a/c" << divide ( a,c) << endl;
        cout <<"c/b" << divide ( c,b) << endl;
    }
    catch (int ) 
    {
        cout << "except of divide zero" << endl;

     }
     cout << "calculate finished" << endl;
     return 0;
     
}

运行结果

复制代码
 a/b2
b/a0.5
except of divide zero
calculate finished

6.课后习题

1.
复制代码
#include <iostream>
using namespace std;
int main()
{
    int a, b, c;
    char ch;
    cin >> a >> ch >> b >> c;
    cout << a << endl << ch << endl << b << endl << c;
    return 0;
}

运行结果:

复制代码
1
A
2
3
2.
复制代码
#include <iostream>
using namespace std;
int main()
{
    int arr[4] = {1, 2, 3, 4}, i;
    int *a = arr;
    int &p = a; 
    p++;
    *p = 100;
    cout << *a << "\t" << *p << endl;
    for (i = 0; i < 4; i++)
        cout << arr[i] << "\t";
    cout << endl;
    int b = 10;
    p = &b;
    cout << *a << "\t" << *p << endl;
    for (i = 0; i < 4; i++)
        cout << arr[i] << "\t";
    cout << endl;
    return 0;
}

运行结果:

复制代码
100  100
1  100  3  4
10  10
1  100  3  4
3.
复制代码
#include <iostream>
using namespace std;
int i = 0;
int main()
{
    int i = 5;
    {
        int i = 7;
        cout << "i=" << i << "::i=" << ::i << endl;
        cout << "::i=" << ::i << endl;
        ::i = 1;
        cout << "::i=" << ::i << endl;
    }
    cout << "i=" << i << endl;
    cout << "please input x,y:";
    ::i = 6;
    i += ::i;
    ::i = 100;
    cout << "i=" << i << endl;
    cout << "::i=" << ::i << endl;
    return 0;
}

运行结果:

复制代码
i=7::i=0
::i=0
::i=1
i=5
please input x,y:
i=6
::i=100
4.
复制代码
#include <iostream>
using namespace std;
void f(double x = 50.6, int y = 10, char z = 'A');
int main()
{
    double a = 216.34;
    int b = 2;
    char c = 'E';
    f();
    f(a);
    f(a, b);
    f(a, b, c);
    return 0;
}
void f(double x, int y, char z)
{
    cout << "x=" << x << "\t" << "y=" << y << "\t";
    cout << "z=" << z << endl;
}

运行结果:

复制代码
x=50.6   y=10   z=A
x=216.34   y=10   z=A
x=216.34   y=2   z=A
x=216.34   y=2   z=E
5.
复制代码
#include <iostream>
using namespace std;
int & s(const int &a, int &b)
{
    b += a;
    return b;
}
int main()
{
    int x = 500, y = 1000, z = 0;
    cout << x << '\t' << y << '\t' << z << '\n';
    s(x, y);
    cout << x << '\t' << y << '\t' << z << '\n';
    z=s(x, y);
    cout << x << '\t' << y << '\t' << z << '\n';
    s(x, y) = 200;
    cout << x << '\t' << y << '\t' << z << '\n';
    return 0;
}

运行结果:

复制代码
500    1000    0
500    1500    0
500    2000    2000
500    200    2000
6.
复制代码
#include <iostream>
using namespace std;
void fun(int x, int &y)
{
    x += y;
    y += x;
}
int main()
{
    int x = 5, y = 10;
    fun(x, y);
    fun(y, x);
    cout << "x=" << x << ",y=" << y << endl;
    return 0;
}

运行结果:

复制代码
x=25 , y=25

完成方式:根据书本例题,在vs code上打出代码,并运行结果,复制到markdown里面,我有时还使用豆包,我认为比起deepseek来豆包的反应时间更短,而且用了这么就我也习惯了他的使用方式。有事因为某些原因,代码不能运行也可以直接在豆包里面,得到解答并直接运行.

相关推荐
saltymilk7 小时前
C++ 模板参数推导问题小记(模板类的模板构造函数)
c++·模板元编程
感哥7 小时前
C++ lambda 匿名函数
c++
沐怡旸13 小时前
【底层机制】std::unique_ptr 解决的痛点?是什么?如何实现?怎么正确使用?
c++·面试
感哥14 小时前
C++ 内存管理
c++
聚客AI14 小时前
🙋‍♀️Transformer训练与推理全流程:从输入处理到输出生成
人工智能·算法·llm
大怪v16 小时前
前端:人工智能?我也会啊!来个花活,😎😎😎“自动驾驶”整起!
前端·javascript·算法
惯导马工18 小时前
【论文导读】ORB-SLAM3:An Accurate Open-Source Library for Visual, Visual-Inertial and
深度学习·算法
骑自行车的码农20 小时前
【React用到的一些算法】游标和栈
算法·react.js
博笙困了20 小时前
AcWing学习——双指针算法
c++·算法
感哥20 小时前
C++ 指针和引用
c++