for(int i = 0; i < CACHE_NUM; i++){ raw_head[i] = new raw_list; raw_tail[i] = new raw_list; raw_head[i]->next = raw_tail[i]; raw_head[i]->pre = nullptr; raw_tail[i]->pre = raw_head[i]; raw_tail[i]->next = nullptr; result_head[i] = new result_list; result_tail[i] = new result_list; result_head[i]->next = result_tail[i]; result_head[i]->pre = nullptr; result_tail[i]->pre = result_head[i]; result_tail[i]->next = nullptr; recv_data_cnt[i] = 0; raw_num[i] = 0; processed_num[i] = 0; processing_num[i] = 0; result_num[i] = 0; ordered_num[i] = 0; current_pos[i] = raw_head[i]; ordered_edge[i] = result_head[i]; }
时间: 2024-04-03 10:33:24 浏览: 21
这是一个初始化函数,用于对多个链表进行初始化操作。具体来说,这个函数会创建 `CACHE_NUM` 个双向链表,并对这些链表进行初始化操作,包括:
1. 创建头节点和尾节点,并分别将它们的指针存储在 `raw_head[i]`、`raw_tail[i]`、`result_head[i]` 和 `result_tail[i]` 四个数组中,其中 `i` 的范围是从0到 `CACHE_NUM - 1`。
2. 将头节点的下一个节点指向尾节点,将尾节点的前一个节点指向头节点,从而形成一个空链表。
3. 初始化一些计数器和指针,用于追踪链表的状态和操作。具体来说,这些计数器和指针包括 `recv_data_cnt[i]`、`raw_num[i]`、`processed_num[i]`、`processing_num[i]`、`result_num[i]`、`ordered_num[i]`、`current_pos[i]` 和 `ordered_edge[i]`,其中 `i` 的范围是从0到 `CACHE_NUM - 1`。
4. 将 `current_pos[i]` 指向 `raw_head[i]`,将 `ordered_edge[i]` 指向 `result_head[i]`。
这样,我们就可以向这些链表中添加数据或者从这些链表中删除数据了。
相关问题
帮我改以下代码的错#include <stdio.h> int main() { int mem_page_num=3; int seq_len=17; int page_seq[] = { 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1 }; int result = opt_missing_page_num(page_seq, seq_len, mem_page_num); printf("%d", result); return 0; } int opt_missing_page_num(int page_seq[], int seq_len, int mem_page_num) { int mem_page[mem_page_num]; int page_fault = 0; int next_use[mem_page_num]; int i, j, k, max_next_use; for (i = 0; i < mem_page_num; i++) { mem_page[i] = -1; next_use[i] = seq_len; } for (i = 0; i < seq_len; i++) { int page = page_seq[i]; int found = 0; for (j = 0; j < mem_page_num; j++) { if (mem_page[j] == page) { found = 1; next_use[j] = seq_len; break; } } if (!found) { int victim = -1; for (j = 0; j < mem_page_num; j++) { int use_time = next_use[j]; if (use_time < seq_len && (victim == -1 || use_time < next_use[victim])) { victim = j; } } mem_page[victim] = page; next_use[victim] = seq_len; page_fault++; } for (j = 0; j < mem_page_num; j++) { int page2 = mem_page[j]; if (page2 != -1) { found = 0; max_next_use = -1; for (k = i + 1; k < seq_len; k++) { if (page_seq[k] == page2) { found = 1; max_next_use = k; break; } } if (!found) { max_next_use = seq_len; } next_use[j] = max_next_use; } } } return page_fault; }
这段代码中的问题是缺少函数的声明,需要在main函数前面加上函数声明:
```c
#include <stdio.h>
int opt_missing_page_num(int page_seq[], int seq_len, int mem_page_num);
int main() {
int mem_page_num=3;
int seq_len=17;
int page_seq[] = { 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1 };
int result = opt_missing_page_num(page_seq, seq_len, mem_page_num);
printf("%d", result);
return 0;
}
int opt_missing_page_num(int page_seq[], int seq_len, int mem_page_num) {
int mem_page[mem_page_num];
int page_fault = 0;
int next_use[mem_page_num];
int i, j, k, max_next_use;
for (i = 0; i < mem_page_num; i++) {
mem_page[i] = -1;
next_use[i] = seq_len;
}
for (i = 0; i < seq_len; i++) {
int page = page_seq[i];
int found = 0;
for (j = 0; j < mem_page_num; j++) {
if (mem_page[j] == page) {
found = 1;
next_use[j] = seq_len;
break;
}
}
if (!found) {
int victim = -1;
for (j = 0; j < mem_page_num; j++) {
int use_time = next_use[j];
if (use_time < seq_len && (victim == -1 || use_time < next_use[victim])) {
victim = j;
}
}
mem_page[victim] = page;
next_use[victim] = seq_len;
page_fault++;
}
for (j = 0; j < mem_page_num; j++) {
int page2 = mem_page[j];
if (page2 != -1) {
found = 0;
max_next_use = -1;
for (k = i + 1; k < seq_len; k++) {
if (page_seq[k] == page2) {
found = 1;
max_next_use = k;
break;
}
}
if (!found) {
max_next_use = seq_len;
}
next_use[j] = max_next_use;
}
}
}
return page_fault;
}
```
// 获取学生总分 void get_total_score(Student *student) { int total = 0; for (int i = 0; i < MAX_COURSE_NUM; i++) { student->total_score = total; } } // 显示学生信息 int show_student_info( Student *student) { printf("学号:%d\t姓名:%s\t成绩:%d %d %d\t总分:%d\n",student->id, student->name,student->scores[0], student->scores[1], student->scores[2],student->total_score); } // 显示所有学生信息及总排名 void show_all_students(Student *student) { // 计算总分 for (int i = 0; i < student_count; i++) { students[i].total_score = get_total_score(&students[i]); } // 排序 for (int i = 0; i < student_count - 1; i++) { for (int j = i + 1; j < student_count; j++) { if (students[i].total_score < students[j].total_score) { Student temp = students[i]; students[i] = students[j]; students[j] = temp; } } } // 显示信息 printf("\n所有学生信息及总排名:\n"); for (int i = 0; i < student_count; i++) { show_student_info(&students[i]); } }哪错了
在函数 get_total_score 中,你每次循环都将总分赋值为0,然后又用循环内的最后一个分数覆盖了总分,所以每个学生的总分都是最后一个分数。应该在循环结束后再将总分赋值给学生。
修改后的代码如下:
```
void get_total_score(Student *student) {
int total = 0;
for (int i = 0; i < MAX_COURSE_NUM; i++) {
total += student->scores[i];
}
student->total_score = total;
}
int show_student_info(Student *student) {
printf("学号:%d\t姓名:%s\t成绩:%d %d %d\t总分:%d\n", student->id, student->name,
student->scores[0], student->scores[1], student->scores[2], student->total_score);
}
void show_all_students(Student *students) {
// 计算总分
for (int i = 0; i < student_count; i++) {
get_total_score(&students[i]);
}
// 排序
for (int i = 0; i < student_count - 1; i++) {
for (int j = i + 1; j < student_count; j++) {
if (students[i].total_score < students[j].total_score) {
Student temp = students[i];
students[i] = students[j];
students[j] = temp;
}
}
}
// 显示信息
printf("\n所有学生信息及总排名:\n");
for (int i = 0; i < student_count; i++) {
show_student_info(&students[i]);
}
}
```