Comparing two elements in different arrays of structs?

This is a discussion on Comparing two elements in different arrays of structs? within the C Programming forums, part of the General Programming Boards category; I have two files, `cars.txt` and `reservation.txt`, both of the files have `resID` in common. I want the user to ...

  1. #1
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    Comparing two elements in different arrays of structs?

    I have two files, `cars.txt` and `reservation.txt`, both of the files have `resID` in common.


    I want the user to enter a date, use that date to see the cars that are **unavailable**, then print them (through `resID`).


    car.txt:
    (From left to right: `reservationID`, `carID`, `carYOM`, `carMake`, `carModel`, `carFuel`, `catagory`.)


    Code:
        R001;V001;2003;Toyota;Camry;Petrol;Budget
        R002;V002;2005;Toyota;Prius;Petrol;Economy
        R003;V003;1999;Ford;Falcon;Petrol;Midsize
        R004;V004;2007;Ford;Territory;Diesel;Fullsize
        R005;V005;2010;Ferrari;599;Petrol;Fullsize
        R006;V006;1998;Holden;Comadore;Diesel;Midsize
        R007;V007;2008;Honda;Civic;Petrol;Budget
        R008;V008;2000;Mazda;MX5;Petrol;Economy

    reservation.txt:
    (From left to right: `reservationID`, `customerID`, `reservationStartDate`, `reservationStartTime`, `reservationEndDate`, `reservationEndTime`.)


    Code:
        R001;C005;2012/02/12;09:15A.M;2012/03/15;05:00P.M
        R002;C002;2012/04/15;10:00A.M;2012/04/22;10:30A.M
        R003;C003;2012/01/16;02:11P.M;2012/04/15;12:00P.M
        R004;C004;2012/05/05;03:00P.M;2012/05/08;10:40A.M
        R005;C005;2012/05/15;10:00A.M;2012/04/23;05:00P.M
        R006;C006;2012/04/11;05:30P.M;2012/04/15;10:00A.M
        R007;C008;2012/05/15;03:15P.M;2012/05/18;11:00A.M
        R008;C007;2012/04/15;11:40P.M;2012/04/23;09:00A.M

    The code in question:

    Code:
        #include <stdio.h>
        #include <string.h>
        #define MAX_CAR 100
        #define MAX_RES 100
        
        int main(){
            
            typedef struct{                    //car struct
                char reservationID[20];
                char carID[20];
                char carYOM[20];
                char carMake[20];
                char carModel[50];
                char carFuel[20];
                char catagory[20];
            } car_t;
            
            typedef struct{                    //res struct
                char reservationID[20];
                char customerID[20];
                char reservationStartDate[20];
                char reservationStartTime[20];
                char reservationEndDate[50];
                char reservationEndTime[20];
            } res_t;
            
            car_t car[MAX_CAR];                //car array
            res_t reservation[MAX_RES];        //res array
            FILE *carHandle;
            FILE *resHandle;
            char line[100];
            char *item;
            int rescount = 0;
            int carcount =0;
            int k;
            int i;
            int option;
            char choice[20];    
            
            resHandle = fopen("reservation.txt","r");    
            
            while (fgets(line, 99, resHandle)){
              //cut up the reservation file line by line and put the bits into the res array.
                item = strtok(line,";");
                strcpy(reservation[rescount].reservationID,item);
                item = strtok(NULL,";");
                strcpy(reservation[rescount].customerID,item);
                item = strtok(NULL,";");
                strcpy(reservation[rescount].reservationStartDate,item);
                item = strtok(NULL,";");
                strcpy(reservation[rescount].reservationStartTime,item);
                item = strtok(NULL,";");
                strcpy(reservation[rescount].reservationEndDate,item);
                item = strtok(NULL,"\n");
                strcpy(reservation[rescount].reservationEndTime,item);
                rescount++;
            }
            
            fclose(resHandle);
            
            carHandle = fopen("car.txt","r");    
            
            while (fgets(line, 99, carHandle)){
                //cut up the car file line by line and put the bits into the car array.
                item = strtok(line,";");
                strcpy(car[carcount].reservationID,item);
                item = strtok(NULL,";");
                strcpy(car[carcount].carID,item);
                item = strtok(NULL,";");
                strcpy(car[carcount].carYOM,item);
                item = strtok(NULL,";");
                strcpy(car[carcount].carMake,item);
                item = strtok(NULL,";");
                strcpy(car[carcount].carModel,item);
                item = strtok(NULL,";");
                strcpy(car[carcount].carFuel,item);
                item = strtok(NULL,"\n");
                strcpy(car[carcount].catagory,item);
                carcount++;
            }
            
            fclose(carHandle);
            
            printf("Enter todays date (in YYYY/MM/DD format):");
            scanf("%s", choice);
            for (k=0;k<=rescount; k++){
                if (strcmp(choice,reservation[k].reservationStartDate)>=0 && strcmp(choice,reservation[k].reservationStartDate)>=0){
                    for (i=0;i<=carcount; i++){
                        if (strcmp(car[i].reservationID,reservation[i].reservationID)==0){
                            printf("\nreservationID: %s\nreservationStartTime: %s\ncustomerID: %s\ncarid: %s\nyom: %s\nmake: %s\nmodel: %s\nfueltype: %s\ncategory: %s\n\n", car[k].reservationID, reservation[i].reservationStartTime, reservation[i].customerID, car[k].carID, car[k].carYOM, car[k].carMake, car[k].carModel, car[k].carFuel, car[k].catagory);
                            goto outofloop;
                        }
                    }
                }else printf("\nall the cars are available\n");
                break;
            }
            outofloop:
        
            return(0);
        }

    Currently the code only works with input strings '2012/02/12' to '2012/03/15' (i.e the first line of the reservation file)


    Any other input string will not get past the first if statement.


    Any help would be very appreciated!

  2. #2
    and the hat of int overfl Salem's Avatar
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    You've already got a thread making progress here -> Foreign Keys Using Array Of Structs In C. - C And C++ | Dream.In.Code
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    Quote Originally Posted by Salem View Post
    You've already got a thread making progress here -> Foreign Keys Using Array Of Structs In C. - C And C++ | Dream.In.Code
    Heh, small world

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