Question

如何做一个选择题考试系统

要求：实现此系统可以导入选择题，判断题，做完后提交可以自动算分。

Answer 1

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

struct question {
char ask[200];/*选择题题目*/
char answer[4][80];/*选择题选项*/
int right;/*正确答案*/
struct question *next;
};

int MenuChoice(void);
struct question *InsertList(struct question *fst, const struct question *ad);
struct question *ListSeek(struct question *seek, long len, long max);
void GetQuestion(struct question *src);
void SaveFile(const struct question *ed, FILE *saf);
struct question *LoadFile(struct question *td, FILE *laf);
int GetAnswer(void);
void ExplainQuestion(const struct question *que, int n);

main()
{
struct question *start = NULL, temp;
long choice, line = 0, c;
FILE *fp = fopen("kstm.dat", "a+");

start = LoadFile(start, fp);

while ((choice = MenuChoice()) != 3)
if (choice == 1) {
GetQuestion(&temp);
start = InsertList(start, &temp);
++line;/*统计列表的长度*/
}
else if (choice == 2){
c =600;
while (c > 500 || c > line) {
printf("请输入要回答的问题数量: ");
scanf("%d", &c);
}

ExplainQuestion(start, line);
}

SaveFile(start, fp);/*进行最后的工作*/
fclose(fp);
return 0;
}

/*ListSeek函数确定一个读取答案的位置，len代表要读取的答案数，max代表列表的长度*/
struct question *ListSeek(struct question *seek, long len, long max)
{
int i;

srand(time(NULL));

while (i = rand() % max + len < max)/*随机选取一个读题目的位置*/
;

while (i--)
seek = seek->next;/*找到指定的位置*/

return seek;
}

/*向列表中插入试题*/
struct question *InsertList(struct question *fst, const struct question *ad)
{
struct question *newPtr = (struct question *)malloc(sizeof(struct question));

if (newPtr == NULL)
exit(0);

*newPtr = *ad;
newPtr->next = fst;

return newPtr;
}

/*获取问题，选项，以及正确答案*/
void GetQuestion(struct question *src)
{
int i = 0;

printf("请输入选择题题目:\n");
scanf("%s", src->ask);

while (i < 4) {
printf("请输入选项%c的答案:\n", i + 'A');
scanf("%s", src->answer[i++]);
}

src->right = GetAnswer();
}

/*从文件中读取题目，将题目添加到列表中*/
struct question *LoadFile(struct question *td, FILE *laf)
{
struct question temp;

while (fread(&temp, 1, sizeof(struct question), laf))
td = InsertList(td, &temp);

return td;
}

/*将列表中的试题保存在文件中*/
void SaveFile(const struct question *ed, FILE *saf)
{
fclose(saf);

if ((saf = fopen("kstm.dat", "w")) == NULL)/*以写的方式重新打开文件*/
return ;

while (ed) {
fwrite(ed, 1, sizeof(struct question), saf);
ed = ed->next;
}

}

/*得到选择题的答案(不保证是正确的答案)*/
int GetAnswer(void)
{
int c = 0;/*必须进行初始化，避免出现偶然性的错误*/

fflush(stdin);
while (c < 'A' || c > 'D') {/*确保输入的答案是A, B, C, D中的一个*/
printf("请输入正确的答案: ");
scanf("%c", &c);
}

return c;
}

/*回答问题,并统计答对题目数,显示得分*/
void ExplainQuestion(const struct question *que, int n)
{
int i = 0, t = n;
char result[1001], *p = result;

for (i = 0; n--; que = que->next) {
printf("%s\nA.%s\nB.%s\nC.%s\nD.%s\n\n", que->ask, que->answer[0], que->answer[1],
que->answer[2], que->answer[3]);

if ((*p = que->right) == (*(p + 1) = GetAnswer()))
++i;

p += 2;
}

*p = '\0';

printf("\n%-13s%-13s%s\n", "标准答案", "您的答案", "评价");
for (p = result; *p != '\0'; p += 2)
printf("%-13c%-13c%s\n", *p, *(p + 1), *p == *(p + 1) ? "正确" : "错误");
printf("\n您回答了%d道题, 答对%d道题目, 得分: %.2f\n\n", t, i, (float)i / t * 100.00);
}

/*选择菜单*/
int MenuChoice(void)
{
int value;

printf("1 - 添加选择题\n2 - 回答选择题\n3 - 退出\n");
scanf("%d", &value);

return value;
}

随即抽题
struct question *ListSeek(struct question *seek, long len, long max)
{
int i;
srand(time(NULL));
while (i = rand() % max + len < max)/*随机选取一个读题目的位置*/
;
while (i--)
seek = seek->next;/*找到指定的位置*/
return seek;
}

Answer 2

借助已经开发好的、功能非常完善的在线考试系统就可以了。往往在线考试系统功能齐全完善，题库功能支持上传选择题、判断题、填空题、简答题等多种题型的。组卷考试也很简单。
在线考试完之后，系统会自动阅卷判分，十分便捷。

Answer 3

你这个问题问的就好比是"如何生一个儿子?"一样..你自己都还没实践. 你就来问. 自己先做做吧. 遇到问题了再来问.