用C语言代码实现单选题考试系统的用户答题功能

可以使用结构体来存储题目和答案，然后使用循环来遍历题目并让用户输入答案，最后统计得分即可。以下是示例代码：

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

#define MAX_QUESTIONS 10
#define MAX_ANSWER_LENGTH 20

typedef struct {
    char question[100];
    char answer[MAX_ANSWER_LENGTH];
} Question;

int main() {
    Question questions[MAX_QUESTIONS];
    int num_questions = 0;
    int score = 0;

    // Add some sample questions
    strcpy(questions[num_questions].question, "What is the capital of France?");
    strcpy(questions[num_questions].answer, "Paris");
    num_questions++;

    strcpy(questions[num_questions].question, "What is the largest planet in our solar system?");
    strcpy(questions[num_questions].answer, "Jupiter");
    num_questions++;

    // Ask the user each question
    for (int i = 0; i < num_questions; i++) {
        printf("%d. %s\n", i + 1, questions[i].question);

        char user_answer[MAX_ANSWER_LENGTH];
        scanf("%s", user_answer);

        if (strcmp(user_answer, questions[i].answer) == 0) {
            printf("Correct!\n");
            score++;
        } else {
            printf("Incorrect. The correct answer is %s.\n", questions[i].answer);
        }
    }

    printf("You scored %d out of %d.\n", score, num_questions);

    return 0;
}

这个程序可以让用户回答两个单选题，每个题目有一个正确答案。用户输入答案后，程序会告诉他们答案是否正确，并统计得分。