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

int main() {
    while (true) {
        srand(time(0));
        printf("Train\n");
        printf("Creative Computing Morristown, New Jersey\n");
        printf("Time - Speed Distance Exercise:");
        int car = (rand() %(65-40+1))+40;
        int distance = (rand() %(20-5+1))+5;
        int train = (rand() %(39-20+1))+20;
        printf(" A car traveling %d MPH can make a certain trip in %d hours less than a train traveling at %d MPH.\n", car, distance, train);
        while (true) {
            char input[5];
            printf("\nHow long does a trip take by car ");
            fgets(input, 5, stdin);
            double answer = atof(input);
            int car_time = distance * train / (car - train);
            int percent = abs(((car_time)-answer)*100/answer)+.5;
            if (percent > 5) {
                printf("Sorry, you were off by %d percent\n", percent);
                printf("Correct answer is %d hours\n", car_time);
            } else {
                printf("Good!, Answer within %d percent\n", percent);
                printf("Another Problem? (yes or no)");
                char newgame[5];
                fgets(newgame, 5,stdin);
                if (strcmp("yes", newgame)) {
                    break;
                }
                return 1;
            }
            continue;
        }
    }
}