poj1028解题报告

//gcc AC:

#include<stdio.h>
#include<string.h>

//stack related region//
#define MAX_STACK_SIZE 101
#define MAX_CHAR_NUM 71

char backward[MAX_STACK_SIZE][MAX_CHAR_NUM];
char forward[MAX_STACK_SIZE][MAX_CHAR_NUM];

int index_bw;
int index_fw;

char read_cmd[10],read_url[MAX_CHAR_NUM];
char currentURL[MAX_CHAR_NUM];

void init()
{
	strcpy(currentURL,"http://www.acm.org/");
	index_bw = 0;
	index_fw = 0;
}

void back_process()
{
	if (index_bw==0)
	{
		printf("Ignored\n");
		return;
	}
	else
	{
		strcpy(forward[index_fw++],currentURL);
		strcpy(currentURL,backward[--index_bw]);
		printf("%s\n",currentURL);
	}
}

void forward_process()
{
	if (index_fw==0)
	{
		printf("Ignored\n");
		return;
	}
	else
	{
		strcpy(backward[index_bw++],currentURL);
		strcpy(currentURL,forward[--index_fw]);
		printf("%s\n",currentURL);
	}
}

void visit_process()
{
	strcpy(backward[index_bw++],currentURL);
	strcpy(currentURL,read_url);
	index_fw = 0;
	printf("%s\n",currentURL);
}


int main()
{
	init();
	while (scanf("%s",&read_cmd))
	{
		if (0==strcmp(read_cmd,"QUIT"))
			break;
		if (0==strcmp(read_cmd,"BACK"))
		{
			back_process();
		}
		else if (0==strcmp(read_cmd,"FORWARD"))
		{
			forward_process();
		}
		else if (0==strcmp(read_cmd,"VISIT"))
		{
			scanf("%s",&read_url);
			visit_process();
		}
	}

	return 0;
}

完全按照题目提示写就可以了。。。