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Julli [10]
2 years ago
14

When this program is compiled and executed on an x86-64 Linux system, it prints the string 0x48\n and terminates normally, even

though function p2 never initializes variable main. Can you explain this?
Computers and Technology
1 answer:
Alexxandr [17]2 years ago
5 0

Answer:

I get 0x55 and this the linking address of the main function.

use this function to see changes:

/* bar6.c */

#include <stdio.h>

char main1;

void p2()

{

printf("0x%X\n", main1);

}

Output is probably 0x0

you can use your original bar6.c with updaated foo.c

char main;

int main() // error because main is already declared

{

  p2();

   //printf("Main address is 0x%x\n",main);

  return 0;

}

Will give u an error

again

int main()

{

  char ch = main;

  p2(); //some value

  printf("Main address is 0x%x\n",main); //some 8 digit number not what printed in p2()

  printf("Char value is 0x%x\n",ch); //last two digit of previous line output

  return 0;

}

So the pain in P2() gets the linking address of the main function and it is different from address of the function main.

Now char main (uninitialized) in another compilation unit fools the compiler by memory-mapping a function pointer on a char directly, without any conversion: that's undefined behavior. Try char main=12; you'll get a multiply defined symbol main...

Explanation:

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// GetData.java

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public class GetData

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  public static double getDouble(String s)

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      return Double.parseDouble(getWord(s));

  }

  public static int getInt(String s)

  {

      return Integer.parseInt(getWord(s));

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  public static String getWord(String s)

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  }

  public static String getString(String s)

  {

      return JOptionPane.showInputDialog(s);

  }

}

// Address.java

public class Address

{

  private String street, city, state, zip;

  public Address(String str, String city, String st, String zip)

  {

      street = str;

      this.city = city;

      state = st;

      this.zip = zip;

  }

  public String getStreet()

  {

      return street;

  }

 

  public String getCity()

  {

      return city;

  }

  public String getState()

  {

      return state;

  }

  public String getZip()

  {

      return zip;

  }

}

// Manufacturer.java

public class Manufacturer

{

  private String companyName;

  private Address companyAddress;

 

  public Manufacturer()

  {

      this.companyName = "";

      this.companyAddress = null;

  }

 

  public Manufacturer(String compName, Address address)

  {

      this.companyName = compName;

      this.companyAddress = address;

  }

 

  public String getCompanyName()

  {

      return companyName;

  }

 

  public void setCompanyName(String companyName)

  {

      this.companyName = companyName;

  }

 

  public Address getCompanyAddress()

  {

      return companyAddress;

  }

 

  public void setCompanyAddress(Address address)

  {

      this.companyAddress = address;

  }

}

// Product.java

import java.text.SimpleDateFormat;

import java.util.Date;

public class Product

{

 

  SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");

 

 

  Manufacturer manufacture;

 

 

  String productName;

 

 

  int quantity;

 

 

  double unitPrice;

 

 

  Date productCreated;

 

 

  public Product()

  {

      this.productName = "";

      this.quantity = 0;

      this.unitPrice = 0.0;

      this.productCreated = null;

      this.manufacture = null;

  }

 

  public Product(String prodName, int quantity, double unitPrice,

                        Date productCreated, Manufacturer manufact)

  {

      this.productName = prodName;

      this.quantity = quantity;

      this.unitPrice = unitPrice;

      this.productCreated = productCreated;

      this.manufacture = manufact;

  }

 

 

  public Date getProductCreated()

  {

      return productCreated;

  }

 

 

  public void setProductCreated(Date productCreated)

  {

      this.productCreated = productCreated;

  }

 

  // to get the Manufacturer object

  public Manufacturer getManufacture()

  {

      return manufacture;

  }

 

  // to set the Manufacturer object

  public void setManufacture(Manufacturer manufacture)

  {

      this.manufacture = manufacture;

  }

 

  // to get the name of the product

  public String getProductName()

  {

      return productName;

  }

 

  // to set the name of the product

  public void setProductName(String prodName)

  {

      this.productName = prodName;

  }

 

  // to get the quantity of the product

  public int getQuantity()

  {

      return quantity;

  }

 

  // to set the quantity of the product

  public void setQuantity(int quantity)

  {

      this.quantity = quantity;

  }

 

  // to get the unit price of the product

  public double getUnitPrice()

  {

      return unitPrice;

  }

 

  // to set the unit price of product

  public void setUnitPrice(double unitPrice)

  {

      this.unitPrice = unitPrice;

  }

 

  // to update the quantity of the product

  public void upDateQuantity(int quantity_upDate)

  {

      quantity += quantity_upDate;

  }

 

  // to update the price of the product

  public void upDatePrice(double price_upDate)

  {

      this.unitPrice = price_upDate;

  }

 

 

  public String getProductInfomation()

  {

      String result = "";

      result += String.format("%-30s", productName);

      String dateForm = sdf.format(productCreated);

      result += String.format("\t %s", dateForm);

      result += String.format("%10d", quantity);

      result += String.format("\t%15.2f", unitPrice);

      result += String.format("\t%15s",

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      result += String.format("\t%20s",

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      return result;

  }  

}

Explanation:

  • Create a manufacturer class to store and get information about company name and company address.
  • Create a product class to hold the manufacturer object, product name and other relevant information.
4 0
2 years ago
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