这C语言的实操代码怎么做（救救刚学C的孩子）
0
悬赏园豆：5
[待解决问题]
学生随机抽号演讲计分系统
设计一款用于课程大作业检查或比赛计分的软件，基本功能：
（1） 设置本课程的学生总数
（2） 根据本次参与的学生总数，随机抽取一个还未汇报演讲的学生的学号。
（3） 每个学生汇报演讲完毕，输入该学生的得分（假设有5个评委，则需输入5个成绩）。
（4） 计算该选手的得分：去掉最高分和最低分，其余的分数求平均，并显示选手序号、姓名、得分。
（5） 输出参加比赛过的所有学生的成绩及当前排名。
（6） 对演讲过的学生作上标记，下次程序运行时不再抽取该学号。
（7） 每次退出程序时（不一定一次能进行完所有的学生的汇报，可以分多次进行），将学生的序号、姓名、成绩写入文件。
（8） 结束对学生成绩进行排序，显示，并按照一等奖10%、二等奖20%、三等奖30%的比例确定选手的获奖名次，并将结果写入文件保存。
拓展功能：赛前事先输入评委人数，设置选手姓名、序号，选手上场顺序由程序随机抽取，已经抽取过的选手信息在文件中做出标记，下次不再抽取。其他更多方便用户使用的功能。
所有回答(2)
0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
typedef struct {
int id;
char name[20];
float scores[5];
float average;
int marked;
} Student;
void random_select(Student *students, int total);
void input_scores(Student *student);
void calculate_average(Student *student);
void sort_students(Student *students, int total);
void save_to_file(Student *students, int total);
void display_ranking(Student *students, int total);
void determine_prize(Student *students, int total);
int main() {
int total;
printf("请输入本课程的学生总数：");
scanf("%d", &total);
Student students[total];
for (int i = 0; i < total; i++) {
printf("请输入第%d个学生的序号和姓名：", i + 1);
scanf("%d %s", &students[i].id, students[i].name);
students[i].marked = 0;
}
int round = 1;
while (1) {
printf("第%d轮比赛开始，请按回车键继续...", round);
getchar();
random_select(students, total);
for (int i = 0; i < total; i++) {
if (!students[i].marked) {
input_scores(&students[i]);
calculate_average(&students[i]);
}
}
sort_students(students, total);
display_ranking(students, total);
save_to_file(students, total);
determine_prize(students, total);
printf("是否继续下一轮比赛？(y/n)：");
char choice;
scanf(" %c", &choice);
if (choice == 'n' || choice == 'N') {
break;
}
round++;
}
return 0;
}
void random_select(Student *students, int total) {
srand(time(NULL));
int index;
do {
index = rand() % total;
} while (students[index].marked);
students[index].marked = 1;
}
void input_scores(Student *student) {
printf("请输入学生%d的得分（用空格隔开）：", student->id);
for (int i = 0; i < 5; i++) {
scanf("%f", &student->scores[i]);
}
}
void calculate_average(Student *student) {
float sum = 0;
for (int i = 1; i < 4; i++) {
sum += student->scores[i];
}
student->average = sum / 3;
}
void sort_students(Student *students, int total) {
for (int i = 0; i < total - 1; i++) {
for (int j = 0; j < total - 1 - i; j++) {
if (students[j].average < students[j + 1].average) {
Student temp = students[j];
students[j] = students[j + 1];
students[j + 1] = temp;
}
}
}
}
void save_to_file(Student *students, int total) {
FILE *fp = fopen("scores.txt", "w");
if (fp == NULL) {
printf("无法打开文件！");
return;
}
for (int i = 0; i < total; i++) {
fprintf(fp, "学号：%d 姓名：%s 得分：%.2f
", students[i].id, students[i].name, students[i].average);
}
fclose(fp);
}
void display_ranking(Student *students, int total) {
printf("排名：
");
for (int i = 0; i < total; i++) {
printf("%d. 学号：%d 姓名：%s 得分：%.2f
", i + 1, students[i].id, students[i].name, students[i].average);
}
}
void determine_prize(Student *students, int total) {
float prize_total = total * 0.1f;
float current_total = 0;
for (int i = 0; i < total && current_total < prize_total; i++) {
if (students[i].average >= 90) {
current_total += 0.1f;
printf("恭喜学生%d获得一等奖！
", students[i].id);
} else if (students[i].average >= 80) {
current_total += 0.1f;
printf("恭喜学生%d获得二等奖！
", students[i].id);
} else if (students[i].average >= 70) {
current_total += 0.1f;
printf("恭喜学生%d获得三等奖！
", students[i].id);
}
}
}
0
好的，我将为你提供一个简单的C语言实操代码，实现上述基本功能。请注意，这是一个基础版本，实际应用中可能需要更多的功能和优化。以下是一个简单的示例代码：
c
Copy code
include <stdio.h>
include <stdlib.h>
include <string.h>
include <time.h>
define MAX_STUDENTS 100
typedef struct {
int id;
char name[50];
float score;
int presented; // 是否已经演讲
} Student;
void initializeStudents(Student students[], int totalStudents) {
for (int i = 0; i < totalStudents; ++i) {
students[i].id = i + 1;
sprintf(students[i].name, "Student%d", i + 1);
students[i].score = 0.0;
students[i].presented = 0;
}
}
void drawRandomStudent(Student students[], int totalStudents, int *selectedId) {
int remainingStudents = 0;
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 0) {
remainingStudents++;
}
}
if (remainingStudents == 0) {
printf("All students have presented.\n");
*selectedId = -1;
return;
}
int randomIndex = rand() % remainingStudents;
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 0) {
if (randomIndex == 0) {
*selectedId = students[i].id;
students[i].presented = 1; // 标记为已经演讲
break;
} else {
randomIndex--;
}
}
}
}
void recordScores(Student students[], int totalStudents, int selectedId) {
if (selectedId == -1) {
return;
}
printf("Enter scores for Student %d (%s):\n", selectedId, students[selectedId - 1].name);
for (int i = 0; i < 5; ++i) {
printf("Judge %d: ", i + 1);
scanf("%f", &(students[selectedId - 1].score));
}
}
void calculateAndDisplayResults(Student students[], int totalStudents) {
printf("\nResults:\n");
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 1) {
// 计算平均分（去掉最高分和最低分）
float minScore = students[i].score;
float maxScore = students[i].score;
float totalScore = students[i].score;
for (int j = 1; j < 5; ++j) {
float score;
printf("Judge %d: ", j + 1);
scanf("%f", &score);
if (score < minScore) {
minScore = score;
}
if (score > maxScore) {
maxScore = score;
}
totalScore += score;
}
totalScore -= minScore + maxScore;
students[i].score = totalScore / 3.0;
// 显示选手序号、姓名、得分
printf("Student %d (%s): %.2f\n", students[i].id, students[i].name, students[i].score);
}
}
}
void displayAllResults(Student students[], int totalStudents) {
printf("\nAll Results:\n");
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 1) {
// 显示学生的序号、姓名、成绩
printf("Student %d (%s): %.2f\n", students[i].id, students[i].name, students[i].score);
}
}
}
void writeResultsToFile(Student students[], int totalStudents, const char *filename) {
FILE *file = fopen(filename, "w");
if (file == NULL) {
printf("Error opening file for writing.\n");
return;
}
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 1) {
fprintf(file, "%d %s %.2f\n", students[i].id, students[i].name, students[i].score);
}
}
fclose(file);
}
int compareStudents(const void *a, const void *b) {
float scoreA = ((Student *)a)->score;
float scoreB = ((Student *)b)->score;
if (scoreA < scoreB) {
return 1;
} else if (scoreA > scoreB) {
return -1;
} else {
return 0;
}
}
void displayRankings(Student students[], int totalStudents) {
// 对学生成绩进行排序
qsort(students, totalStudents, sizeof(Student), compareStudents);
printf("\nRankings:\n");
for (int i = 0; i < totalStudents; ++i) {
if (students[i].presented == 1) {
// 显示学生的序号、姓名、成绩
printf("Rank %d: Student %d (%s): %.2f\n", i + 1, students[i].id, students[i].name, students[i].score);
}
}
}
int main() {
srand((unsigned int)time(NULL));
int totalStudents;
printf("Enter the total number of students: ");
scanf("%d", &totalStudents);
if (totalStudents > MAX_STUDENTS || totalStudents < 1) {
printf("Invalid number of students.\n");
return 1;
}
Student students[MAX_STUDENTS];
initializeStudents(students, totalStudents);
int selectedId;
do {
drawRandomStudent(students, totalStudents, &selectedId);
if (selectedId != -1) {
recordScores(students,
