This is a basic quiz program in C. It will have a timer which was implemented using multi-threading. It will randomly displays questions on sum, product and subtractions. Finally displays the result showing the count of questions answered, correct answers and wrong answers

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

int quiz_time = 2; // change the quiz time in minutes
int total_questions = 5; // change total number of questions


int i = 0;
int answered = 0;
int correct = 0;
int wrong = 0;

int _time = 0;
int computed_seconds;

void endQuiz(int timeout){
    
    if(timeout==1){
        printf("Time out : Quiz ended !");
    }else{
        printf("Quiz ended !");
    }
    
    printf(" == Your Result == ");
    printf("Questions answered : %d", answered);
    printf("Correct answers : %d", correct);
    printf("Wrong answers : %d", wrong);
    
    exit(0);
    
}

void *timerThread(void *vargp){
    
    computed_seconds = quiz_time * 60;
    
    for(i = 0; i < computed_seconds; i++){
        
    sleep(1);
    _time = _time + 1;
    
    }
    
    endQuiz(1); // Calling quiz end function when the time gets over
    
    return NULL;
}

void *askQuestion(void *args){
    
int _i,a,b;
int minutes,seconds;
int operand;
int ans;

for(_i = 0; _i < total_questions; _i++){
    
srand(time(NULL));
a = rand() % 10;
b = rand() % 5;
operand = rand() % 2;

switch(operand){
    
    case 0: printf("Sum of %d & %d : ",a,b);
            scanf("%d",&ans);
            answered++;
            
            if((a+b) == ans){
                correct++;
            }else{
                wrong++;
            }
            break;

    case 1: printf("Product of %d & %d : ",a,b);
            scanf("%d",&ans);
            answered++;
            if((a*b) == ans){
                correct++;
            }else{
                wrong++;
            }
            break;
            
    case 2: printf("What is %d - %d : ",a,b);
            scanf("%d",&ans);
            answered++;
            if((a-b) == ans){
                correct++;
            }else{
                wrong++;
            }
            break; 
    
    default : break;
}

computed_seconds = quiz_time * 60;
minutes = (int)(computed_seconds-_time)/60;
seconds = abs((((minutes - (float)(computed_seconds-_time)/60) * 100 ) /100 ) * 60);


printf("Time remaining : %d minutes %d seconds", minutes,seconds );


}

endQuiz(0); // Calling quiz end function when the questions gets over

}

int main(){
    
    pthread_t tid,qid;
    
    printf("Quiz started");
    
    pthread_create(&qid, NULL, askQuestion, NULL);
    pthread_create(&tid, NULL, timerThread, NULL);
    
    pthread_join(qid, NULL);
    pthread_join(tid, NULL);
    
    return 0;
}

 

Quiz started

Product of 1 & 2 : 2

Time remaining : 1 minutes 54 seconds

Product of 2 & 1 : 2

Time remaining : 1 minutes 53 seconds

Sum of 2 & 3 : 5

Time remaining : 1 minutes 50 seconds

Product of 9 & 2 : 18

Time remaining : 1 minutes 47 seconds

Product of 0 & 2 : 2

Time remaining : 1 minutes 42 seconds

Quiz ended !

 == Your Result ==

Questions answered : 5
Correct answers : 4
Wrong answers : 1