【C++】&引用

#include"stdio.h"
#include"malloc.h"
#include
using namespace std;
void main()
{
    int j;
    int& i = j;
    int  k = 8;
    j = 9;
    i = k;                    //仅仅是赋值
    cout << i << j;
    k = 10;
    cout << i << j;
}
#include"stdio.h"
#include"malloc.h"
#include
using namespace std;
void main()
{
    int* i;
    int k;
    int*& j = i;   
        j = &k;
    k = 5;
    int*& l = j;
    cout << *j << *i << *l;

}
#include"stdio.h"
#include"malloc.h"
#include
using namespace std;
float& f(float& r)
{
    r = 3.14 * r * r;
    return(r);
}

void main() {
        float a = 5;
        float& c = f(a);
        cout << a << c;
        c = c + 1;
        cout << a << c;
}