02 通过指针间接修改变量的值

#include <stdio.h>
int main()
{
    int a = 0;
    int b = 11;
    int* p = &a;
    *p = 100;
    printf("a = %d, *p = %d\n", a, *p);  // a = 100, *p = 100
    p = &b;
    *p = 22;
    printf("b = %d, *p = %d\n", b, *p);  // b = 22, *p = 22
    return 0;
}