boolean/function call help

This is a discussion on boolean/function call help within the C Programming forums, part of the General Programming Boards category; Can someone please aid me in finding solutions and help fixing the errors in my program. The object is to ...

  1. #1
    Registered User
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    Apr 2009
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    Post boolean/function call help

    Can someone please aid me in finding solutions and help fixing the errors in my program.
    The object is to calculate a parking fee with various vehicle types at different times.
    Any help is appreciated.

    Code:
    #include <stdio.h>
    #include <stdbool.h>
    
    /* Constants */
    #define car 5                    /* vehicle */
    #define motorbike 2              /* vehicle */
    #define truck 10                 /* vehicle */
    
    /* function prototypes */
    char validateVehicleType(int c, int m, int t);
    float validateParkingTime(float h);
    float getParkingFee(int c, int m, int t, float h);
    float displayParkingFee(int c, int m, int t, float h);
    
    int main (void)
    {
       /* declare variables */
          float h;              /* hrs */
    	  
    	  /* Validate vehicle type. */
    	  printf("Enter your vehicle type:");
    	  scanf("%c");
    	  
    	  /* Display vehicle type */
    	  if ( vehicle type == c || m || t)
    	     printf("%d\n");
    	  else if ( vehicle type != c || m || t)
    	     printf("Wrong vehicle type");
    		 
    	  /* Validate parking time */
    	  printf("Enter parking time (hours):");
    	  scanf("%f", &hrs);
    	  
    	  /* Display parking time */
    	  if ( parking time >= 0.0)
    	     printf("%f\n");
    	  else if ( parking time < 0.0)
    	     printf("Wrong parking time");
    		 
    	  /* Get parking fee */
    	  parking_fee = getParkingFee(int c, int m, int t, float h);
    	  
    	  /* Display parking fee */
    	  printf("Parking_fee = %.2f\n", dollars);
    	  
    }
    
          /* function definitions */
    	  
    	  float displayParkingFee(int c, int m, int t, float h);
    {
    	        return ((c || m || t)*h);
    			if (h>4 && h<=12)
    			   return("(parking_fee)*0.75 %.2f\n", dollars);
    			else if (h>12)
    			   return("(parking_fee)*0.5 %.2f\n", dollars);
    			else if (h<4)
    			   return(0);
    }

  2. #2
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    What part isn't working?

  3. #3
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    Right off the bat I'd say
    Code:
    scanf("%f", &hrs);
    should be
    Code:
    scanf("%f", &h);

  4. #4
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    Quote Originally Posted by bithub View Post
    What part isn't working?
    ^...

  5. #5
    DESTINY BEN10's Avatar
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    Quote Originally Posted by jma619 View Post
    Can someone please aid me in finding solutions and help fixing the errors in my program.
    The object is to calculate a parking fee with various vehicle types at different times.
    Any help is appreciated.

    Code:
    #include <stdio.h>
    #include <stdbool.h>
    
    /* Constants */
    #define car 5                    /* vehicle */
    #define motorbike 2              /* vehicle */
    #define truck 10                 /* vehicle */
    
    /* function prototypes */
    char validateVehicleType(int c, int m, int t);
    float validateParkingTime(float h);
    float getParkingFee(int c, int m, int t, float h);
    float displayParkingFee(int c, int m, int t, float h);
    
    int main (void)
    {
       /* declare variables */
          float h;              /* hrs */
    	  
    	  /* Validate vehicle type. */
    	  printf("Enter your vehicle type:");
    	  scanf("%c");
    	  
    	  /* Display vehicle type */
    	  if ( vehicle type == c || m || t)
    	     printf("%d\n");
    	  else if ( vehicle type != c || m || t)
    	     printf("Wrong vehicle type");
    		 
    	  /* Validate parking time */
    	  printf("Enter parking time (hours):");
    	  scanf("%f", &hrs);
    	  
    	  /* Display parking time */
    	  if ( parking time >= 0.0)
    	     printf("%f\n");
    	  else if ( parking time < 0.0)
    	     printf("Wrong parking time");
    		 
    	  /* Get parking fee */
    	  parking_fee = getParkingFee(int c, int m, int t, float h);
    	  
    	  /* Display parking fee */
    	  printf("Parking_fee = %.2f\n", dollars);
    	  
    }
    
          /* function definitions */
    	  
    	  float displayParkingFee(int c, int m, int t, float h);
    {
    	        return ((c || m || t)*h);
    			if (h>4 && h<=12)
    			   return("(parking_fee)*0.75 %.2f\n", dollars);
    			else if (h>12)
    			   return("(parking_fee)*0.5 %.2f\n", dollars);
    			else if (h<4)
    			   return(0);
    }
    1.you have not given arguments to many of the printf and scanf functions.
    2. use uppercase letters for symbolic constants to differentiate them from normal variables.
    3.you have defined only one function out of the four declared.
    4.keep in mind the precedence of opeartors while using them in the if statements.it can lead to wrong outputs.
    5.your return statements are also wrong.
    6.return 0 at the end of the main function.

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