Code:
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define MAX_TESTS 10
#define MAXQUESTION 100
bool myread(const char *format, void *address)
{
char buffer[1024];
fgets(buffer, sizeof buffer, stdin);
return sscanf(buffer, format, address) == 1;
}
struct struc {
int a;
int b;
int c;
int add;
int grade;
};
struct struc ques_db[MAXQUESTION]; //database to hold all the previous questions
int ques_db_count = 0; //count of question currently in the database
//function to traverse the question in database and
// see if the current question has already been asked
int find_in_db(struct struc *t)
{
int i;
for (i = 0; i < ques_db_count; i++) {
// check to see if the question in database is same as
// the current generated one. It compares value of a, b
// add (i.e. result) if all of them are same then the
// question was same as the current one
if (ques_db[i].a == t->a && ques_db[i].b == t->b && ques_db[i].add == t->add)
return -1;
}
return 0;
}
int add_in_db(struct struc *t) //function to add the currently generated question to database
{
//first check if the question is already there in the db
if (-1 == find_in_db(t))
return -1;
else { // if not there then add to the db for future reference
ques_db[ques_db_count++] = *t;
return 0;
}
}
int sj(int n)
{
int t;
t = rand() % n;
return t;
}
void ctm_i(struct struc *t)
{
do {
t->a = sj(101);
t->c = sj(4);
if (t->c == 1) {
t->b = sj(101 - (t->a));
t->add = (t->a) + (t->b);
} else {
t->b = sj((t->a) + 1);
t->add = (t->a) - (t->b);
}
t->grade = 0;
}
while (add_in_db(t) != 0); //process repeats if question is not added due to repetition
}
void print_positive_message()
{
char positive_words[8][50] = {
"\n Bingo!",
"\n Great job!",
"\n Very good!",
"\n Brilliant!",
"\n That's correct!",
"\n You got it!",
"\n Bravo!",
"\n Awesome!"
};
srand((unsigned) time(NULL));
// Replace your print statement here
printf("%s", positive_words[rand() % 8]);
}
void tcm_i(struct struc *t, int n)
{
int ad;
printf(" Question %d\n\n", n + 1);
printf(" You have 3 attempts for this question\n\n");
if (t->c == 1)
printf(" %d+%d= ", t->a, t->b);
else
printf(" %d-%d= ", t->a, t->b);
myread("%d", &ad);
if (ad == t->add)
{
t->grade = 10;
print_positive_message();
printf(" You earned 10 marks\n\n");
}
else {
printf("\n Incorrect, you have 2 attempts remaining\n\n");
printf(" ");
myread("%d", &ad);
if (ad == t->add)
{
t->grade = 7;
print_positive_message();
printf(" You earned 7 marks\n\n");
}
else {
printf("\n Incorrect, you have 1 attempt remaining\n\n");
printf(" ");
myread("%d", &ad);
if (ad == t->add)
{
t->grade = 5;
print_positive_message();
printf(" You earned 5 marks\n\n");
}
else {
t->grade = 0;
printf("\n Failure, 0 mark\n\n");
printf("\n The correct answer is %d\n\n", t->add);
}
}
}
}
void display_instructions()
{
// function created only to display instructions of quiz
printf(" ***********************************************************************" "************\n");
printf(" ......................................................................." "............\n");
printf(" ************************************* Welcome! ************************************\n");
printf(" ......................This program is for students Grades 1-2......................\n");
printf("\n Program description:\n");
printf(" (1)10 questions are randomly generated, each question is worth 10 points.\n");
printf(" (2)Only addition and subtraction within 100 is allowed.\n"
" The sum and the difference of the two numbers do not exceed the range of 0-100.\n"
" Negative numbers are not included.\n");
printf(" (3)There are 3 attempts for each question.；\n");
printf(" (4)For each question:\n"
" 1. 10 points will be awarded for the first successful attempt.\n"
" 2. 7 points for the second attempt.\n"
" 3. 5 points for the third attempt.\n");
printf(" (5)At the end of the program enter:\n"
" 'P' to start a new game;\n"
" 'S' to show the results;\n"
" 'Q' to quit.\n\n");
}
void quiz(char name[])
{
// function created to enclose quiz functionality apart from instructions
int rounds = 0;
int highest = 0;
int lowest = INT_MAX;
float allScore = 0;
float avg = 0;
int i, j, g = 0;
//char x;
struct struc test[MAX_TESTS];
srand((unsigned) time(NULL));
for (;;) {
for (i = 0; i < MAX_TESTS; i++) // generate all questions
{
ctm_i(&test[i]);
for (j = 0; j < i; j++)
if (test[i].a == test[j].a && test[i].b == test[j].b && test[i].c == test[j].c)
//if question is already present
ctm_i(&test[i]); //then re-generate
}
//int ig = getchar();
char x;
printf("\n Are you ready? Press Enter key to continue. ");
myread("%c",&x);
// Take quiz
for (i = 0; i < MAX_TESTS; i++)
tcm_i(&test[i], i);
printf(" End\n\n");
bool done = false;
bool unsure = true;
bool showS = true;
while (unsure) {
unsure = false;
puts("\n");
if (showS) {
puts(" Enter 'S' to show results");
}
puts(" Enter 'P' to play another round");
//puts(" Enter 'Q' to quit");
puts(" Enter 'R' to return to main menu");
char choice;
printf(" ");
myread("%c", &choice);
if (choice == 'r' || choice == 'R') {
done = true;
} else if (choice == 'S' || choice == 's') {
showS = false;
// calculate total score for current round
g = 0;
for (i = 0; i < MAX_TESTS; i++) {
g += test[i].grade; //add score of each question
}
allScore += g; //add current round's score to total
avg = allScore / rounds; //average of all rounds
if (g > highest) {
highest = g;
}
if (g < lowest) {
lowest = g;
}
if (rounds == 1) {
printf(" Final score: %d/100\n", g); //display round score
printf(" ****** Player: %s ******\n", name);
} else {
//puts("Whoops! Looks like highest/lowest have not been adjusted!");
printf(" Round %d score: %d/100\n", rounds, g); //display round score
printf(" Highest score: %d/100\n", highest);
printf(" Lowest score: %d/100\n", lowest);
printf(" Average score: %f\n", avg);
printf(" ****** Player: %s ******\n", name);
}
unsure = true;
//getchar();
} else if (choice == 'P' || choice == 'p') {
g = 0;
for (i = 0; i < MAX_TESTS; i++) {
g += test[i].grade; //add score of each question
}
allScore += g; //add current round's score to total
if (g > highest) {
highest = g;
}
if (g < lowest) {
lowest = g;
}
} else {
puts(" Invalid input!");
unsure = true;
}
}
if (done)
break;
}
}
// importing maincode.c file to allow to call quiz() an display_instructions()
char choiceY(char option[30])
{
char choice;
do {
myread(" %c", &choice); //take user input
if (choice == 'y' || choice == 'Y') {
return 'y';
}
if (choice == 'n' || choice == 'N') {
if (strcmp(option, "Quit") == 0) //if the input is for quit check wheather entered No
{
return 'n';
}
// what happens here?
}
// Not Y or N
printf(" Invalid input! Please enter 'Y' to Quit or 'N' to return to the main menu: \n");
} while ( 1 );
return '0';
}
int main()
{
int i1 = 1;
char name[25]; // ig;
printf(" Enter your name: "); // Prompting the user to enter his/her name
myread("%[^\n]%*c", name);
printf("\n Welcome %s\n", name);
printf("\n Press Enter key to continue.");
char enter = 0;
myread("%c", &enter);
printf("\n");
while (i1 != 0) {
printf(" * Main Menu of Maths Quiz *\n");
printf(" * 1.Enter Quiz *\n");
printf(" * 2.Instructions *\n");
printf(" * 3.Quit *\n");
printf(" ****************************************************************************\n");
printf(" Please choose one from 1-3:\n");
printf(" ");
if( myread("%d", &i1) ) {
switch (i1) {
case 1:
printf("\n Enter Quiz:\n");
quiz(name); // calling quiz function defined in file "maincode.c"
break;
case 2:
printf("\n Instructions:\n\n");
display_instructions(); // calling display_instructions function defined in file "maincode.c" to display instructions of quiz
printf("\n Back to main menu? ");
printf(" Press 'Y' for Yes.\n");
printf(" ");
choiceY("Instructions"); //to validate user input
break;
case 3:
printf(" Are you sure you want to quit this program?\n"); // Confirming if user really wants to quit
printf(" Press 'Y' for Yes or 'N' for No: ");
char choice = choiceY("Quit"); //to validate user input
if (choice == 'y') {
i1 = 0;
printf(" Quit.\n");
} else
continue;
break;
default:
printf("Invalid input! Please select from options 1, 2 or 3\n");
}
} else {
printf("Not an integer\n");
}
}
return 0;
}
