用C语言设计一个系统，其中主要功能为：可以选择相应的章节（可以单个章节，也可以部分章节），难度，生成一份自测试题，根据学生的答题结果，生成一份结果分析报告，涵盖已掌握知识点情况和未掌握知识点情况。

以下是一个简单的C语言程序，实现了上述功能：

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

#define MAX_CHAPTERS 10
#define MAX_QUESTIONS 20
#define MAX_OPTIONS 5

typedef struct {
char question[100];
char options[MAX_OPTIONS][50];
int answer;
int difficulty;
} Question;

typedef struct {
char name[50];
Question questions[MAX_QUESTIONS];
int num_questions;
} Chapter;

Chapter chapters[MAX_CHAPTERS];
int num_chapters;

void add_chapter();
void add_question(int chapter_index);
void generate_test();
void analyze_result();

int main() {
num_chapters = 0;
int choice;
do {
printf("1. Add chapter\n");
printf("2. Add question\n");
printf("3. Generate test\n");
printf("4. Analyze result\n");
printf("5. Exit\n");
printf("Enter your choice: ");
scanf("%d", &choice);
switch (choice) {
case 1:
add_chapter();
break;
case 2:
if (num_chapters == 0) {
printf("No chapters found. Please add a chapter first.\n");
} else {
int chapter_index;
printf("Select chapter:\n");
for (int i = 0; i < num_chapters; i++) {
printf("%d. %s\n", i + 1, chapters[i].name);
}
printf("Enter choice: ");
scanf("%d", &chapter_index);
add_question(chapter_index - 1);
}
break;
case 3:
generate_test();
break;
case 4:
analyze_result();
break;
case 5:
break;
default:
printf("Invalid choice. Please try again.\n");
}
} while (choice != 5);
return 0;
}

void add_chapter() {
if (num_chapters == MAX_CHAPTERS) {
printf("Maximum number of chapters reached.\n");
return;
}
printf("Enter chapter name: ");
scanf("%s", chapters[num_chapters].name);
chapters[num_chapters].num_questions = 0;
num_chapters++;
}

void add_question(int chapter_index) {
Chapter *chapter = &chapters[chapter_index];
if (chapter->num_questions == MAX_QUESTIONS) {
printf("Maximum number of questions reached.\n");
return;
}
Question *question = &chapter->questions[chapter->num_questions];
printf("Enter question: ");
scanf(" %[^\n]s", question->question);
for (int i = 0; i < MAX_OPTIONS; i++) {
printf("Enter option %d: ", i + 1);
scanf("%s", question->options[i]);
}
printf("Enter index of correct answer: ");
scanf("%d", &question->answer);
printf("Enter difficulty level (1-5): ");
scanf("%d", &question->difficulty);
chapter->num_questions++;
}

void generate_test() {
if (num_chapters == 0) {
printf("No chapters found. Please add a chapter first.\n");
return;
}
int num_questions;
printf("Enter number of questions: ");
scanf("%d", &num_questions);
printf("Select chapter(s) (enter 0 to stop):\n");
for (int i = 0; i < num_chapters; i++) {
printf("%d. %s\n", i + 1, chapters[i].name);
}
int chapter_indices[MAX_CHAPTERS];
int num_chapter_indices = 0;
int chapter_index;
do {
printf("Enter choice: ");
scanf("%d", &chapter_index);
if (chapter_index != 0) {
chapter_indices[num_chapter_indices] = chapter_index - 1;
num_chapter_indices++;
}
} while (chapter_index != 0 && num_chapter_indices < MAX_CHAPTERS);
printf("Select difficulty level (1-5): ");
int difficulty;
scanf("%d", &difficulty);
printf("Test questions:\n");
int num_test_questions = 0;
for (int i = 0; i < num_chapter_indices && num_test_questions < num_questions; i++) {
Chapter *chapter = &chapters[chapter_indices[i]];
for (int j = 0; j < chapter->num_questions && num_test_questions < num_questions; j++) {
Question *question = &chapter->questions[j];
if (question->difficulty == difficulty) {
printf("%d. %s\n", num_test_questions + 1, question->question);
for (int k = 0; k < MAX_OPTIONS; k++) {
printf("%c) %s\n", 'A' + k, question->options[k]);
}
num_test_questions++;
}
}
}
}

void analyze_result() {
if (num_chapters == 0) {
printf("No chapters found. Please add a chapter first.\n");
return;
}
int num_questions;
printf("Enter number of questions: ");
scanf("%d", &num_questions);
int correct_answers = 0;
int chapter_scores[MAX_CHAPTERS] = {0};
for (int i = 0; i < num_questions; i++) {
printf("Question %d:\n", i + 1);
char answer;
int chapter_index;
int question_index;
printf("Enter answer: ");
scanf(" %c", &answer);
printf("Enter chapter index: ");
scanf("%d", &chapter_index);
printf("Enter question index: ");
scanf("%d", &question_index);
Question *question = &chapters[chapter_index].questions[question_index];
if (answer == 'A' + question->answer) {
correct_answers++;
chapter_scores[chapter_index] += question->difficulty;
}
}
printf("Correct answers: %d/%d\n", correct_answers, num_questions);
printf("Chapter scores:\n");
for (int i = 0; i < num_chapters; i++) {
printf("%s: %d\n", chapters[i].name, chapter_scores[i]);
}
}