C语言指针初识

#include <stdio.h>
void change(int *a, int *b) // * 指针类型
{
    int tmp = *a; //去a地址取值
    *a = *b; //去b地址取值赋给a地址的值
    *b = tmp;
}

int main()
{
    int a = 5;
    int b = 6;
    change(&a, &b); //&取地址符
    printf("num a = %d , b = %d \n", a, b);
    return 0;
}