Masalah Dengan Constant

[Admin2 12]

#include<stdio.h>
#define RATE1 1.20 //Alternative lain kalau nak setkan nilai Rate
#define RATE2 1.00 //Alternative lain kalau nak setkan nilai Rate

float get_payment(float);
void display(char[],float,float);


main()

{
    char name[100];

    float weight,payment;

    int i;

    for(i=0; i<3;i++) 
    {
    
        printf("--------------------------------------------\n");
        printf("          ENTER LAUNDRY INFORMATION\n");
        printf("--------------------------------------------\n");

        fflush(stdin);
        printf("Enter name: ");
        gets(name);

        printf("Enter weight of laundry (kg): ");
        scanf("%f", &weight);


        printf("--------------------------------------------\n");
        printf("         LAUNDRY PAYMENT INFORMATION\n");
        printf("--------------------------------------------\n");

        payment = get_payment(weight);
            
        display(name,weight,payment);








} //For loop punya end

}




float get_payment(float weight)


{
    float pay, ratePkg, rate;

    ratePkg = 0;
    if(weight>=0 && weight <=5) 
    
    {

          ratePkg = 1.20; //Masalah sekrang ialah nak tulis code ni kat line ni const ratePkg = 1.20. tapi bila set constant kat sini tak boleh return value.
    }    
    
    else if(weight>5) 
    {
    

        ratePkg = 1.00;   //Masalah sekrang ialah nak tulis code ni kat line ni const ratePkg = 1.00. tapi bila set constant kat sini tak boleh return value.
    }     
         
    

pay = weight * ratePkg;
        
    return pay;



    
}






void display(char name[],float weight,float payment)

{
    printf("Customer Name: %s\n", name);
    printf("Laundry Weight (kg): %.2f\n", weight);
    printf("Payment : RM%.2f\n", payment);

}

kalau kita set kan const ratePkg = 1.20; atau const ratePkg = 1.20; kat bahagian function get_payment camne? sebab soalan dia suruh setkan constant dalam function get_payment cam kat bawah ni:

Question 3

You are required to create a complete program for UNIVERSITY LAUNDRY.

• In main() function :

o Get user input for name and amount of laundry kilogram.

o Call function get_payment(...) and send amount of kilogram to calculate the payment for the service.

o Call function display() to display the customer's name, kilogram and payment.

• In function get_payment(...) :

o Get the amount of kilogram from main() function.

o Calculate the payment by referring to the following table.

o The rate per kilogram must be DEFINE AS CONSTANT <----- NI LA DIA!!

KILOGRAM RATE PER KILOGRAM

0 – 5 RM 1.20

> 5 RM 1.00

• In function display() :

o display the customer's name, kilogram and payment

• This program must be repeated for three customers.

• Use a for loop for this process.

[Paralys3r 0]

bila dia cakap

The rate per kilogram must be DEFINE AS CONSTANT

biasanya dia maksudkan gunakan #define directive. So solution awak biasanya

#define RATE1 1.20
#define RATE2 1.00

[betik 11]

float get_payment(float weight)
{
    float pay, ratePkg, rate;

    ratePkg = 0;
    if(weight>=0 && weight <=5) 
    
    {

          ratePkg = 1.20; //Masalah sekrang ialah nak tulis code ni kat line ni const ratePkg = 1.20. tapi bila set constant kat sini tak boleh return value.
    }

yup...spt ckp Paralys3r....

satu lg...ratePkg bkn x return value, tp kalu ko wat "const ratePkg = 1.20", sebenarnya, function tu x akan assign ratePkg tu kpd nilai 1.20 sbb ko declarekan dia sbg constant...dia akan tetap spt nilai sebelum ni (i.e: ratePkg = 0 yg ko da assign awal2 tu)...

[Admin2 12]

thanx paralys3r dan betik. ye aku dah faham dah. so aku kena guna gak la #define ye. ookk

[otai_g 3]

x payah guna define pun blh.ni cth yg aku buat

#include <iostream>

using namespace std;

//#define RATE1 1.20 //Alternative lain kalau nak setkan nilai Rate
//#define RATE2 1.00 //Alternative lain kalau nak setkan nilai Rate

double get_payment(float);
void display(char*,float,float);

void main()
{
    char name[100];
    float weight, payment;
    int i;

    for(i=0; i<3; i++)
    {
    
        cout<<"--------------------------------------------"<<endl;
        cout<<"          ENTER LAUNDRY INFORMATION         "<<endl;
        cout<<"--------------------------------------------"<<endl;

        cout<<"Enter name : ";
        cin>>name;

        cout<<"Enter weight of laundry (kg) : ";
        cin>>weight;

        cout<<"--------------------------------------------"<<endl;
        cout<<"         LAUNDRY PAYMENT INFORMATION        "<<endl;
        cout<<"--------------------------------------------"<<endl;

        get_payment(weight);
         
        payment = get_payment(weight);
        display(name,weight,payment);
    
    } //For loop punya end

} //main punya end


double get_payment(float weight)
{
    float pay = 0;
    const double ratePkg_1 = 1.2;
    const double ratePkg_2 = 1;

    if (weight>=0 && weight <=5)    
           pay = weight * ratePkg_1; 
            
    else 
        pay =  6 + ( (weight-5) * ratePkg_2 );   
    
    return pay;  
   
} // end get_payment function


void display(char name[], float weight, float payment)
{
    cout<<"Customer Name : "<<name<<endl;
    cout<<"Laundry Weight (kg) : "<<weight<<endl;
    cout<<"Payment : RM "<<payment<<endl;
}

Edited August 13, 2008 by otai_g