学习：C++ 引用

#include "stdio.h"
void swapA(int* a, int* b)
{
    int c = 0;
    c = *a;
    *a = *b;
    *b = c;
}

void swapB(int& a, int& b)
{
    int c = 0;
    c = a;
    a = b;
    b = c;
}

int main(void)
{
    int a1 = 10, a2 = 20, c1 = 30, c2 = 40;
    swapA(&a1, &a2);
    swapB(c1, c2);
    printf("%dt%dt%dt%dt", a1, a2, c1, c2);
}

Save as *.cpp.