[nefu]C++程序设计与分析实验 - 锐格

[nefu]C++程序设计与分析实验 - 锐格

第二章 C++基础

5330

#include<iostream>
#include<iomanip>

using namespace std;

int main()
{
    cout<<123<<endl<<setw(6)<<456<<endl;
    return 0;
}

5331

#include<iostream>

using namespace std;

const double PI =3.14;

int main()
{
    int a;
    cin>>a;
    float s = a*a*PI;
    cout<<"s is "<<s<<endl;
    return 0;
}

5332

#include<iostream>

using namespace std;

int main()
{
    void *a = nullptr;
    int b;
    char c;
    cin>>b>>c;
    a = &b;
    printf("%d\n", *(int*)(a));
    a = &c;
    cout<<*(char*)a<<endl;
    return 0;
}

5333

#include<iostream>

using std::cout;
using std::cin;

template<typename T>
T getNum(T& num)
{
    return num*num*num;
}

int main()
{
    int i;
    long j;
    double k;
    cin>>i>>j>>k;

    printf("%d*%d*%d= %d\n", i, i, i, getNum(i));
    printf("%ld*%ld*%ld= %ld\n", j, j ,j , getNum(j));
    printf("%.2lf*%.2lf*%.2lf= %.3lf\n", k, k, k, getNum(k));
    return 0;
}

5334

#include<iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
    int *p=new int();
    *p=10;
    cout<<*p<<endl;
    delete(p);
    return 0;
}

5335

#include<iostream>

using std::cout;
using std::cin;
using std::endl;

void swap(int &a,int &b)
{
    int tmp = a;
    a = b;
    b = tmp;
}

int main()
{
    int x,y;
    cin>>x>>y;
    swap(x, y);
    printf("x=%d y=%d", x, y);
    return 0;
}

---

5336

#include<iostream>

using std::cout;
using std::cin;
using std::endl;

template<int n>
struct Fib{
    static constexpr int value = Fib<n-1>::value + Fib<n-2>::value;
};

template <> struct Fib<1>{
    static constexpr int value = 1;
};

template <> struct Fib<0>{
    static constexpr int value = 0;
};

int main()
{
    constexpr static int values[] = {
            Fib<1>::value,  Fib<2>::value,  Fib<3>::value,  Fib<4>::value,  Fib<5>::value,
            Fib<6>::value,  Fib<7>::value,  Fib<8>::value,  Fib<9>::value,  Fib<10>::value,
            Fib<11>::value, Fib<12>::value, Fib<13>::value, Fib<14>::value, Fib<15>::value,
            Fib<16>::value, Fib<17>::value, Fib<18>::value, Fib<19>::value, Fib<20>::value
    };
    for(auto& i : values)
    {
        cout<<i<<endl;
    }
    return 0;
}

5337

#include<iostream>
#include<cmath>

using std::cout;
using std::cin;
using std::endl;using std::sqrt;

template<typename T>
T sroot(T& num){
    return sqrt(num);
}

int main()
{
    int i; long l; double b;
    cin>>i>>l>>b;
    cout<<"sqrt(i)= "<<sroot(i)<<" sqrt(l)= "<<sroot(l)<<" sqrt(d)= "<<sroot(b)<<endl;
    return 0;
}

5338

#include<iostream>
#include<cmath>

using std::cout;
using std::cin;
using std::endl;using std::sqrt;

template<typename T>
void swap(T& p1,T& p2)
{
    auto tmp = p1;
    p1=p2;
    p2=tmp;
}

int main()
{
    int a, b;
    cin >> a >> b;

    if (a > b) {
        swap(a, b);
    }

    cout << "x= " << a << " " << "y= " << b;

    return 0;
}

第3章 类和对象

5339

#include <iostream>

using std::cin; using std::cout;

class Score final {
private:
    int mid;
    int fin;

public:
    Score()=default;
    ~Score()=default;
    
    void set(int mid_p, int fin_p) {
        mid = mid_p;
        fin = fin_p;
    }
    
    void get() {
        std::cout << "mid is " << mid << " " << "fin is " << fin << std::endl;
        // std::cout << "total is " << mid * 0.3 + fin * 0.7 << std::endl;
        
        printf("total is %d\n", (int)(mid * 0.3 + fin * 0.7));
    }
};

int main() {
    Score s1;
    s1.set(80, 88);
    s1.get();
    
    Score s2;
    s1.set(90, 92);
    s1.get();
    
    return 0;
}

5340

#include <iostream>

using std::cin; using std::cout;

class Score final {
private:
    int mid;
    int fin;

public:
    Score()=default;
    ~Score()=default;

    void set(int mid_p, int fin_p) {
        mid = mid_p;
        fin = fin_p;
    }

    void get() {
        std::cout << "mid is " << mid << " " << "fin is " << fin << std::endl;
        // std::cout << "total is " << mid * 0.3 + fin * 0.7 << std::endl;

        printf("total is %d\n", (int)(mid * 0.3 + fin * 0.7));
    }
};

int main() {
    int a1,a2,b1,b2;
    cin>>a1>>b1>>a2>>b2;
    Score s1;
    s1.set(a1, b1);
    s1.get();

    Score s2;
    s1.set(a2, b2);
    s1.get();

    return 0;
}