多项选择题标准化考试系统设计

Question

多项选择题标准化考试系统设计\n设计一个多项选择题标准化考试系统，该系统要求能自动组卷和评分。教师可以添加题库，题库包括题干、四个备选答案和正确答案。完成自动组卷。学生选择试卷并进行答题，答题结束后自动给出成绩。教师可查看学生成绩。主要功能包括：\n一级菜单：按教师、学生两个角色登录\n教师二级菜单：\n（1）试题录入：增加试题到试题库中。\n（2）用文件保存试题库。（每个试题包括题干、4个备选答案、标准答案）。\n（3）显示学生成绩列表\n学生二级菜单：\n（1）试题抽取：每次从试题库中可以随机抽出N道题（N由键盘输入）。\n（2）答题：用户可实现输入自己的答案。\n（3）自动判卷：系统可根据用户答案与标准答案的对比实现判卷并给出成绩。

Answer 1

#include <
stdio.h>
#include <
stdlib.h>
#include <
string.h>
 
// 结构体定义typedef struct {char question[100];
char choices[4][50];
int answer;
} Question;
 
// 函数声明void addQuestion(Question *questionBank, int *numQuestions);
void saveQuestionBank(Question *questionBank, int numQuestions);
void extractQuestions(Question *questionBank, int numQuestions, int numExtracted);
void answerQuestions(Question *questionBank, int numExtracted);
 
int main() {int role;
Question questionBank[100];
int numQuestions = 0;
printf("
Enter role (1 for teacher, 2 for student):"
);
scanf("
%d"
, &
role);
if (role == 1) {addQuestion(questionBank, &
numQuestions);
saveQuestionBank(questionBank, numQuestions);
} else if (role == 2) {int numExtracted;
printf("
Enter number of questions to extract:"
);
scanf("
%d"
, &
numExtracted);
extractQuestions(questionBank, numQuestions, numExtracted);
answerQuestions(questionBank, numExtracted);
} else {printf("
Invalid role selected"
);
}return 0;
} 
// 添加试题到试题库void addQuestion(Question *questionBank, int *numQuestions) {printf("
Enter question:"
);
getchar();
fgets(questionBank[*numQuestions].question, sizeof(questionBank[*numQuestions].question), stdin);
printf("
Enter choices A, B, C, D:"
);
for (int i = 0;
 i <
 4;
 i++) {fgets(questionBank[*numQuestions].choices[i], sizeof(questionBank[*numQuestions].choices[i]), stdin);
}printf("
Enter correct answer (1 for A, 2 for B, 3 for C, 4 for D):"
);
scanf("
%d"
, &
questionBank[*numQuestions].answer);
(*numQuestions)++;
} 
// 保存试题库到文件void saveQuestionBank(Question *questionBank, int numQuestions) {FILE *file = fopen("
question_bank.txt"
, "
w"
);
for (int i = 0;
 i <
 numQuestions;
 i++) {fprintf(file, "
%s"
, questionBank[i].question);
for (int j = 0;
 j <
 4;
 j++) {fprintf(file, "
%s"
, questionBank[i].choices[j]);
}fprintf(file, "
%d"
, questionBank[i].answer);
}fclose(file);
} 
// 随机抽取试题void extractQuestions(Question *questionBank, int numQuestions, int numExtracted) {for (int i = 0;
 i <
 numExtracted;
 i++) {int randomIndex = rand() % numQuestions;
printf("
%s
"
, questionBank[randomIndex].question);
for (int j = 0;
 j <
 4;
 j++) {printf("
%c. %s"
, 'A' + j, questionBank[randomIndex].choices[j]);
}}} 
// 答题并判卷void answerQuestions(Question *questionBank, int numExtracted) {int score = 0;
for (int i = 0;
 i <
 numExtracted;
 i++) {int userAnswer;
printf("
Enter your answer for question %d:"
, i+1);
scanf("
%d"
, &
userAnswer);
if (userAnswer == questionBank[i].answer) {score++;
}}printf("
Your score is %d/%d
"
, score, numExtracted);
}

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