How to display saved information?

Question

It took me 2 weeks for my program to work properly, but I decided to change it, but I need help, the idea looks good in my head, but when it’s time to code, I don’t know where to start :( I want the user the program entered its license plate number, and at the end of the day the administrator should be able to see all the license plate numbers of each client and their total number, similar to this

Customer 1 A1546 $ 20

And I would like it to work in the opposite way, the administrator should be able to enter the license plate number, and the information should be displayed. I was thinking about how to do this, and the only way that I think can work is to save all the information in a file, then the program reads the file and displays it? Any help would be truly appreciated. Code below:

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

/*Global Declarations*/
char chContinue = 'Y';
int Continue = 1;
int  Total=1;

//************************************
//********DISCOUNT FUNCTION************
//************************************
int calculateDiscount(Total) {

    char type;
    int  Total1;
    int Discount;

    printf("\nDo you have a pilot licence?(Y/N)\n");
    scanf("%c", &type);
    while( getchar() != '\n' ) ;

    if(type == 'Y' || type == 'y') {
    Discount = Total * 0.1;
    Total1= Total - Discount;
        printf("\nYou are eligible for a discount\nYour new price is %d ^_^",Total1);
    }

    if(type == 'N' || type == 'n') {
        printf("Thank you for parking here,please submit this ticket when leaving the compound");
    }
    return 0;
}


//************************************
//********LOOP Function****************
//************************************
void Lo_op (count,Total) {
    //char chContinue;
    char arrayname[6];
    int  Total2;
    //int Continue=0;

    printf("\nDo you wish to continue? (Y/N) ");
    scanf("%c", &chContinue);
    while( getchar() != '\n' ) ;


    if (chContinue == 'Y'|| chContinue == 'y' ) {
        Continue = 1;
    }
     else if (chContinue == 'N'|| chContinue == 'n' ) {
        printf("enter pass\n");
        scanf("%s", arrayname);
        strcmp(arrayname,"admin");
        printf ("\n>>>Welcome Administrator!<<<\nWhat would you like to do?");
    /*  printf("\n =========MENU===================\n| ");
    printf(" A) Display Total People Parked Today| \n| ");
    printf(" B) Display Today Total            | \n| ");
    printf(" C) Exit Program                     | \n| ");
    printf("======================================\n\n"); */
        Continue = 2;
    }
    else {
        printf("Invalid input!\n");
    }

}


//************************************
//********Print Time Rates Function*****
//************************************
void Print_time () {

    printf("\n(Choose a letter corresponding with your choice)\nHow long will you be parking at our facility?\n ");
    printf("\n =========MENU===============\n| ");
    printf(" A) 30 mins               | \n| ");
    printf(" B) 1 hour                | \n| ");
    printf(" C) 2 hours               | \n| ");
    printf(" D) 5 hours               | \n| ");
    printf(" E) 1 Day                 | \n| ");
    printf(" F) Greater than 1 Day    | \n| ");
    printf("==========================\n\n");

}

//************************************
//********Print Choices For Cars********
//************************************
void  Print_carlist () {

    printf("\nChoose your type of vehicle\n===========================\n| ");
    printf("  1)Car                  |\n| ");
    printf("  2)SUV                  |\n| ");
    printf("  3)Bus                  |\n| ");
    printf("  4)Truck                |\n===========================\n\n");

}

//************************************
//********The main function.************
//***Decide Calculate and Display*******
//************************************

int main() {

    char choice;
    int Total=1, vehicle, /*Discount*/ count=1; //, Continue = 0;
    int Rate_A = 2, Rate_B = 4, Rate_C = 6, Rate_D = 8, Rate_E = 10, Rate_F = 12;
    int Car_rate = 1, Suv_rate = 2, Bus_rate = 3, Truck_rate = 4;
    time_t rawtime;
    struct tm * timeinfo;

    time ( &rawtime );
    timeinfo = localtime ( &rawtime );
    printf ( "The current date/time is: %s", asctime (timeinfo) );


    printf("HELLO AND WELCOME TO THE AUTOMATED PARKING TICKETING SYSTEM\n\nPLEASE FOLLOW THE INSTRUCTIONS ON THE SCREEN\n");
    //Rates(); //Here the function is called.
         srand(time(NULL));
    while (Continue == 1) {

        printf("\n                       You are parker number %d\n ",count);
        Print_time ();
        scanf("%c",&choice);
        while( getchar() != '\n' ) ;

        switch (choice) {
        case 'A':
           Print_carlist();
                scanf("%d",&vehicle);
            while( getchar() != '\n' ) ; /* flush stdin ... */




          if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
               printf("Please follow instructions  \n");
            }

           if(vehicle == 1) {
                printf("You are parking your Car for 30 mins.\n");
                Total = Rate_A * Car_rate;
                    printf("------------------------------\nYour receipt number is A#%d\n", rand()); //generates random number for receipt
                printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                count=count+1;
                 Total=Total+1;

            }

                if(vehicle == 2) {
                    printf("You are parking your SUV for 30 mins.\n");
               Total = Rate_A * Suv_rate;
                    printf("------------------------------\nYour receipt number is A#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
          count=count+1;
          Total=Total+1;
                }

           if(vehicle == 3) {
                printf("You are parking your Bus for 30 mins.\n");
                Total = Rate_A * Bus_rate;
                    printf("------------------------------\nYour receipt number is A#%d\n", rand());
                    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     count=count+1;
                      Total=Total+1;
                }

            if(vehicle == 4) {
                    printf("You are parking your Truck for 30 mins.\n");
                    Total= Rate_A * Truck_rate;
                    printf("------------------------------\nYour receipt number is A#%d\n", rand());
                    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                    count=count+1;
                    Total=Total+1;
                }

                Lo_op (count,Total);


                break;

            case 'B':
                Print_carlist();
                scanf("%d", &vehicle);
            while( getchar() != '\n' ) ; /* flush stdin ... */


            if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
                    printf("Please follow instructions  \n");
            }

                if(vehicle == 1) {
                    printf("You are parking your Car for 1 hour.\n");
                    Total = Rate_B * Car_rate;
                    printf("------------------------------\nYour receipt number is B#%d\n", rand());
                    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                   count=count+1;
                   Total=Total+1;
                }

            if(vehicle == 2) {
                    printf("You are parking your SUV for 1 hour.\n");
                    Total = Rate_B * Suv_rate;
                    printf("------------------------------\nYour receipt number is B#%d\n", rand());
                    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                   count=count+1;
                   Total=Total+1;
                }

                if(vehicle == 3) {
                    printf("You are parking your Bus for 1 hour.\n");
                    Total = Rate_B * Bus_rate;
                printf("------------------------------\nYour receipt number is B#%d\n", rand());
                printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                  count=count+1;
                   Total=Total+1;
            }

            if(vehicle == 4) {
                    printf("You are parking your Truck for 1 hour.\n");
                    Total=Rate_B*Truck_rate;
                    printf("------------------------------\nYour receipt number is B#%d\n", rand());
                    printf("You're total is %d",Total);
                    count=count+1;
                     Total=Total+1;
                }
               Lo_op ();
                break;

            case 'C':
                Print_carlist();
                scanf("%d",&vehicle);
            while( getchar() != '\n' ) ; /* flush stdin ... */


           if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
                printf("Please follow instructions  \n");
            }

          if(vehicle == 1) {
                printf("You are parking your Car for 2 hours.\n");
                Total = Rate_C * Car_rate;
                printf("------------------------------\nYour receipt number is C#%d\n", rand());
                printf("\nYou're total is %d", Total);
                count=count+1;
                 Total=Total+1;
                }

           if(vehicle == 2) {
                    printf("You are parking your SUV for 2hours  .\n");
                    Total = Rate_C * Suv_rate;
                printf("------------------------------\nYour receipt number is C#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
            }

            if(vehicle == 3) {
                printf("You are parking your Bus for 2 hours  .\n");
                Total = Rate_C * Bus_rate;
                printf("------------------------------\nYour receipt number is C#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
           }

         if(vehicle == 4) {
                    printf("You are parking your Truck for 2hours  .\n");
                    Total = Rate_C * Truck_rate;
                    printf("------------------------------\nYour receipt number is C#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
                }
                Lo_op ();
               break;

            case 'D':
          Print_carlist();
            scanf("%d", &vehicle);
                while( getchar() != '\n' ) ; /* flush stdin ... */


            if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
             printf("Please follow instructions  \n");
            }
           if(vehicle == 1) {
                printf("You are parking your Car for 5 hours.\n");
                Total = Rate_D * Car_rate;
                printf("------------------------------\nYour receipt number is D#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
                }
      if(vehicle == 2) {
                printf("You are parking your SUV for 5 hours  .\n");
                Total = Rate_D * Suv_rate;
                printf("------------------------------\nYour receipt number is D#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
                }

            if(vehicle == 3) {
                    printf("You are parking your Bus for 5 hours  .\n");
                    Total = Rate_D * Bus_rate;
                    printf("------------------------------\nYour receipt number is D#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
                }

            if(vehicle == 4) {
                    printf("You are parking your Truck for 5 hours  .\n");
                    Total = Rate_D * Truck_rate;
                    printf("------------------------------\nYour receipt number is D#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
    count=count+1;
     Total=Total+1;
                }
           Lo_op ();
                break;

            case 'E':
                Print_carlist();
                scanf("%d",&vehicle);
                while( getchar() != '\n' ) ; /* flush stdin ... */


                if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
                    printf("Please follow instructions  \n");
                }

                if(vehicle == 1) {
                    printf("You are parking your Car for 1 day .\n");
                    Total = Rate_E * Car_rate;
                    printf("------------------------------\nYour receipt number is E#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
            }
                if(vehicle == 2) {
                    printf("You are parking your SUV for 1 day  .\n");
                    Total = Rate_E * Suv_rate;
                    printf("------------------------------\nYour receipt number is E#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
                }

                if(vehicle == 3) {
                printf("You are parking your Bus for 1 day  .\n");
                    Total = Rate_E * Bus_rate;
                    printf("------------------------------\nYour receipt number is E#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
            }

                if(vehicle == 4) {
                    printf("You are parking your Truck for 1 day  .\n");
                Total = Rate_E * Truck_rate;
                    printf("------------------------------\nYour receipt number is E#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
                }
               Lo_op ();
                break;

            case 'F':
                Print_carlist();
                scanf("%d", &vehicle);
                while( getchar() != '\n' ) ; /* flush stdin ... */


                if((vehicle != 1) && (vehicle != 2) && (vehicle != 3) && (vehicle != 4)) {
                    printf("Please follow instructions  \n");
            }
                if(vehicle == 1) {
                printf("You are parking your Car for more than one day.\n");
                    Total = Rate_F * Car_rate;
                    printf("------------------------------\nYour receipt number is F#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                   calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
            }

                if(vehicle == 2) {
                    printf("You are parking your SUV for more than one day.\n");
                    Total = Rate_F * Suv_rate;
                    printf("------------------------------\nYour receipt number is F#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
                }

                if(vehicle == 3) {
                printf("You are parking your Bus for more than one day.\n");
                    Total = Rate_F * Bus_rate;
                    printf("------------------------------\nYour receipt number is F#%d\n", rand());
    printf("You're total is %d,\nPlease submit this ticket when leaving the compound\n-------------------------------",Total);
                     calculateDiscount(Total);
                    count=count+1;
                     Total=Total+1;
                }

            if(vehicle == 4) {
               printf("You are parking your Truck for more than one day.\n");
                Total = Rate_F * Truck_rate;
                printf("------------------------------\nYour receipt number is F#%d\n", rand());
                printf("You're total is %d",Total);
                calculateDiscount(Total);
                count=count+1;
                 Total=Total+1;
           }
                Lo_op ();
                break;

        default:
            printf("\nSorry your choice is not valid, please enter the letter associated with your choice!\n");
            break;
        }
    }

    return 0;

}

Answer 1

Well, being slightly hypocritical, I will try to offer a couple of tips. First, do not use function headers like K & R, for example:

void Lo_op (count,Total)

Always specify types:

Lo_op(int count, int Total)

-, , , ( , , 4- 5 ), , , . , ¹:

#include <stdio.h>

typedef struct { 
    char *name;
    int rate;
} data_pair;

data_pair actions[] = {
    { "Administration", 0},
    { "Park Car", 1},
    { "Park SUV", 2},
    { "Park Truck", 3},
    { "Park Bus", 4 }
};

#define num_actions (sizeof(actions)/sizeof(transactions[0]))

data_pair rates[] = {
    { "30 minutes", 2},
    { "1 hour", 4 },
    { "2 hours", 6},
    { "5 hours", 8},
    { "1 day", 10 },
    { "More than 1 day", 12}
};

#define num_rates (sizeof(rates)/sizeof(rates[0]))

typedef struct {
    int type;
    int length;
} transaction;

transaction transactions[256];
static transaction_num;

int get_value(char const *prompt, data_pair const *menu, int max) { 
    int value;
    int i;

    printf("%s\n", prompt);
    for (i=0; i<max; i++)
        printf("%d. %s\n", i+1, menu[i].name);

    printf("Please enter a number between 1 and %d: ", max);
    do { 
        scanf("%d", &value);
    } while (value < 0 || value > max+1);
    return value;
}   

int get_action() { 
    return get_value("What do you want to do?\n", actions, num_actions);
}

int get_length() { 
    return get_value("How long do you want to park\n", rates, num_rates);
}

void show_data(int vehicle_type, int length) { 
    printf("You're parking your %s for %s.\n", 
        actions[vehicle_type].name, 
        rates[length].name);
    printf("Your total is: $%f\n", 
        (double)actions[vehicle_type].rate * rates[length].rate);
}

int ask_continue() { 
    int retval;
    printf("Do you want to continue?");
    do { 
        retval = getchar();
        retval = tolower(retval);
    } while (retval != 'n' && retval != 'y');
    return retval;
}

void do_admin() {
    // For now, just display a list of recorded transactions.
    int i;
    for (i=0; i<transaction_num; i++)
        printf("%d: %s %s\n", 
            i+1, 
            actions[transactions[i].type].name, 
            rates[transactions[i].length].name);
}

int main() {
    do { 
        int action = get_action();
        int length;
        transaction t;
        if (action == 1)
            do_admin();
        else {
            length = get_length();
            show_data(action, length);
            t.length=length;
            t.type=action;
            transactions[transaction_num++] = t;
        }

    } while (ask_continue() == 'y'); 
    return 0;
}

¹ , , . , , . , , , . , , , , .

Answer 2

, C. , - (, ..) ( = ?).

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