lesson322_23

#include <iostream>

using namespace std;

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

void show_arr(int size, int* arr) {
    for (int k = 0; k < size; k++)
        cout << arr[k] << " ";
    cout << endl;
}

void work_1pp() {
    int arr[]{ 1,2,3,4,5,6,7,8 };
    show_arr(size(arr), arr);
    for (int k = 0; k < size(arr); k += 2) {
        my_swap(arr[k], arr[k + 1]);
    }
    show_arr(size(arr), arr);
}

int bad_sum(int a, int b) {
    int sum = 0;
    if (a > b)
        my_swap(a, b);
    while (a <= b)
        sum += a++;
    return sum;
}

int sum1(int a, int b) {
    a = a + b;
    b = 12 + a;
    return a + b;
}

int sum2(int* pa, int* pb) {
    return *pa + *pb;
}


void pointer_vs_const() {
    const int cx = 56;
    cout << cx << endl;
    int x = cx;
    x = x + 10;
    int s = x + (double)cx;
    cout << sum1(x, cx) << endl;

    const int* pCx;
    pCx = &cx;
    //*pCx = 45;
    x = *pCx;

    const int cy = 16;
    pCx = &cy;

    int r{ 7 };
    cout << r << endl;

    const int arr[3]{ 3,4,5 };

    const int* pa = arr;
    cout << *pa << endl;
    pa += 2; // я изменил адрес, а не значение
    cout << *pa << endl;
    //arr[1] = 3;

    int w = 14;
    // сделали неизменным адрес cpw
    int* const cpw = &w;
    w = 15;
    *cpw = 16;
    //cpw += 1;
    //cpw = &x;
    const int rr = 17;
    const int* const super_const = &rr;

    //cout << sum2(&x, &cx) << endl;
    //cx = 14;
    //my_swap(cx, x);
}

inline int sum(int a, int b) {
    return a + b;
}

inline int sub(int a, int b) {
    return a - b;
}

inline int mul(int a, int b) {
    return a * b;
}

inline int divide(int a, int b) {
    return a / b;
}

void test_calc() {
    int a, b;
    char op;
    cin >> a >> op >> b;
    int (*pOp)(int, int);
    pOp = sum;
    switch (op) {
        case '+': pOp = sum;  break;
        case '-': pOp = sub;  break;
        case '*': pOp = mul;  break;
        case '/': pOp = divide;  break;
        default:break;
    }
    cout << " = " << pOp(a, b) << endl;
}


int main() {
    //work_1pp();
    //cout << bad_sum(3, 7) << " " << bad_sum(7, 3) << endl;
    //pointer_vs_const();
    test_calc();
}