help

This is a discussion on help within the C Programming forums, part of the General Programming Boards category; hey guys i'm really having trouble with my c programming assignment which is mostly to do with making the program ...

  1. #1
    Registered User
    Join Date
    Apr 2005
    Posts
    2

    help

    hey guys i'm really having trouble with my c programming assignment which is mostly to do with making the program go back to the start.

    ok heres the issues:

    when the word admin is entered at the car registration input the program displays a report screen.

    Code:
     
    void carreg(void)
    {									/* carreg function start */
    	printf("Please Enter Car Registration\n");
    	printf(" \n");
    	scanf("%s",reg);			/* data input 1 (car registration) */
    	printf(" \n");
    	printf(" \n");
    }									/* carreg function end */
    
    void input(void)
    {											/* input function start */
    	check=strcmp(reg,"admin");		/* check for attendant password */
    	if(check==0)						/* if attendant password correct */
    	{
    		system("cls");
    		cash=((float)totalcash)/100;
    		halfvalue=half*20;
    		onevalue=one*60;
    		twovalue=two*120;
    		threevalue=three*150;
    		allvalue=all*400;
    		ticketvalue=(((float)halfvalue)+((float)onevalue)+((float)twovalue)+((float)threevalue)+((float)allvalue))/100;
    		printf("Total Number of Cars Using The Car Park:     %d\n",car);
    		printf("Total Number of Half an Hour Tickets:        %d\n",half);
    		printf("Total Number of One Hour Tickets:            %d\n",one);
    		printf("Total Number of Two Hour Tickets:            %d\n",two);
    		printf("Total Number of Three Hour Tickets:          %d\n",three);
    		printf("Total Number of All Day Tickets:             %d\n",all);
    		printf("Value of Tickets Produced:                   %.2f\n",ticketvalue);
    		printf("Total Cash Taken:                            %.2f\n",cash);
    		printf(" \n");
    		printf("Press any key to reset software...");
    		getch();
    		system("cls");
    		initialise();
    	}
    when a key is pressed the program should then load the initialise function (the first function in the program), but it doesnt. instead it jumps to the output function.

    Code:
    void output(void)
    {										/* output function start */
    	system("cls");
    	getdate(&today);
    	printf("Car Registration:     %s\n",reg);
    	printf("Date:                 %d/%d/%d\n",today.da_day,today.da_mon,today.da_year);
    	printf("Amount Paid:          %.2f\n",paid);
    	printf("Issued:               %02d:%02d\n",now.ti_hour,now.ti_min);
    	printf("Expires:              %02d:%02d\n",expirehour,expiremin);
    }										/* output function end */
    However the function call in the last function (reset) which jumps back to the carreg function works.

    Code:
    void reset(void)
    {										/* reset function start */
    	printf(" \n");
    	printf(" \n");
    	printf("Press Any key To Continue...");
    	getch();
    	coin=0;
    	totalinserted=0;
    	totalcash=0;
    	system("cls");
    	carreg();
    }										/* reset function end */
    another problem then occurs. the program asks for a car registration input and if anything at all is entered the application terminates.

    the next issue is i use a rogue value (-1) to terminate the user input during the input function. this value then gets added to the total (i.e. it takes away -1 from the total) when i attemp to correct this by adding 1 back onto the total the program adds 3 to the total. for example if the total is 30 and i dont remove the rogue value it comes out as 29 but if i add 1 to the total the total comes out as 32. the code below continues from the strcmp command in the input function shown in the first piece of code i quoted.

    Code:
    	else									/* if attendant password incorrect */
    	{
    		while(coin!=-1)
    		{									/* coin input loop start */
    			printf(" \n");
    			printf("Enter -1 To End Input\n");
    			printf(" \n");
    			printf("Please Enter Coin\n");
    			printf(" \n");
    			scanf("%d",&coin);      /* data input 2 (coin) */
    			while((coin!=10)&&(coin!=20)&&(coin!=50)&&(coin!=100)&&(coin!=-1))
    			{								/* validation loop 1 start */
    				printf(" \n");
    				printf(" \n");
    				printf("Invalid Coin\n");
    				printf(" \n");
    				printf("Enter -1 To End Input\n");
    				printf(" \n");
    				printf("Please Enter Coin\n");
    				printf(" \n");
    				scanf("%d",&coin);	/* data input 2 (coin) */
    			}								/* validation loop 1 end */
    			totalinserted=totalinserted+coin;
    		}									/* coin input loop end */
    
    		/* check amount */
    
    		if(totalinserted<20)
    		{
    			printf(" \n");
    			printf(" \n");
    			printf("Not Enough Money!");
    			printf(" \n");
    			printf(" \n");
    			coin=0;
    			input();
    		}
    		else
    		if(totalinserted<60)
    		{
    			half++;
    			car++;
    		}
    		else
    		if(totalinserted<120)
    		{
    			one++;
    			car++;
    		}
    		else
    		if(totalinserted<150)
    		{
    			two++;
    			car++;
    		}
    		else
    		if(totalinserted<400)
    		{
    			three++;
    			car++;
    		}
    		else
    		{
    			all++;
    			car++;
    		}
    
    		/* calculate expiry time */
    
    		if(totalinserted<60)
    		{
    			gettime(&now);
    			expiremin=now.ti_min+30;
    			expirehour=now.ti_hour;
    			if(expiremin>59)
    			{
    				expiremin=expiremin-60;
    				expirehour=now.ti_hour+1;
    			}
    		}
    		else
    		if(totalinserted<120)
    		{
    			gettime(&now);
    			expiremin=now.ti_min;
    			expirehour=now.ti_hour+1;
    		}
    		else
    		if(totalinserted<150)
    		{
    			gettime(&now);
    			expiremin=now.ti_min;
    			expirehour=now.ti_hour+2;
    		}
    		else
    		if(totalinserted<400)
    		{
    			gettime(&now);
    			expiremin=now.ti_min;
    			expirehour=now.ti_hour+3;
    		}
    		else
    		{
    			expiremin=00;
    			expirehour=20;
    		}
    
    		/* check expiry time */
    
    		if(expirehour>19)
    		{
    			expiremin=00;
    			expirehour=20;
    		}
    		totalcash=totalcash+totalinserted;
    	}
    }										/* input function end */
    
    void process(void)
    {										/* process function start */
    	paid=((float)totalinserted)/100;
    }										/* process function end */
    the next function is the output function (which i have alreaded quoted) which the total is shown on.

    the main function may help

    Code:
    main()
    
    {                                                                                                          /* program start */
    
                system("cls");          /* clear screen to remove data from previous applications */
    
     
    
                /* function calls */
    
     
    
                initialise();
    
                carreg();
    
                input();
    
                process();
    
                output();
    
                reset();
    
    }                                                                                                          /* program end */
    if you require the whole code just ask and i will post it

  2. #2
    Registered User
    Join Date
    Apr 2005
    Posts
    2
    ok guys ive sorted it. the strcmp needed to be in the same function as in the input it was checking. the program exiting was caused by the program not calling the functions declared in main, so i called the next function at the end of each function. the adding 3 instead of one was caused by the programing mysteriously looping 3 times during the middle before continuing. i solved this by calling the next function. a little tip i used was to put a test message using printf followed by a getch(); to see if the program is reaching sections of code

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