/*C 練習實例66題目：利用指針方法,輸入3個數a,b,c，按大小順序輸出。*//*指針使用之前一定要先初始化*/#include <stdio.h>void swap(int *a, int *b){    int t;    t = *a;    *a = *b;    *b = t;}int main(){    int a, b, c;    int *p_a, *p_b, *p_c;    PRintf("please input a, b, c (以逗號隔開): /n");    scanf("%d,%d,%d",&a, &b, &c);    p_a = &a;    p_b = &b;    p_c = &c;    if(*p_a < *p_b) swap(p_a, p_b);    if(*p_b < *p_c) swap(p_b, p_c);    if(*p_a < *p_b) swap(p_a, p_b);    printf("由大到小：%d > %d > %d", *p_a, *p_b, *p_c);    return 0;}