#include <stdio.h>

#include <stdlib.h>

#include <time.h>

struct question {

char ask[200];

char answer[4][80];

int right;

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;

}

else if (choice == 2){

c =600;

while (c > 500 || c > line) {

printf("Please scanf the number of the questions you want to answer: ");

scanf("%d", &c);

}

ExplainQuestion(start, line);

}

SaveFile(start, fp);

fclose(fp);

return 0;

}

struct question *ListSeek(struct question *seek, long len, long max)

{

int i;

srand(time(NULL));

while (i = rand() % max + len < max)

;

while (i--)

seek = seek->next;

return seek;

}

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;

}

void GetQuestion(struct question *src)

{

int i = 0;

printf("Please scanf the question:\n");

scanf("%s", src->ask);

while (i < 4) {

printf("Please scanf the answer of %c:\n", i + "A");

scanf("%s", src->answer[i++]);

}

src->right = GetAnswer();

}

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;

}

void SaveFile(const struct question *ed, FILE *saf)

{

fclose(saf);

if ((saf = fopen("kstm.dat", "w")) == NULL)

return ;

while (ed) {

fwrite(ed, 1, sizeof(struct question), saf);

ed = ed->next;

}

}

int GetAnswer(void)

{

int c = 0;

fflush(stdin);

while (c < "A" || c > "D") {

printf("Please scanf the right answer: ");

scanf("%c", &c);

if(c > 96)

c=c-32;

}

return c;

}

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%-20s%-20s%s\n", "Right answer", "Your answer", "Result");

for (p = result; *p != "\0"; p += 2)

printf("%-20c%-20c%s\n", *p, *(p + 1), *p == *(p + 1) ? "True" : "Flase");

printf("\n You have answered %d questions, You pass %d questions , Score: %.2f\n\n", t, i, (float)i / t * 100.00);

}

int MenuChoice(void)

{

int value;

printf("1 - Scanf more questions\n2 - Answer the questions\n3 - Exit\n");

scanf("%d", &value);

return value;

}