Post your C/C++ Programs Here

[timemachine]

Originally Posted by aditya.shevade

^^ No need to go for cygwin just for gcc. Use DevCPP. It uses the win32 portal of gcc, known as mingw32.

MinGW : GTK facility is not available. Lacks of some libraries of gcc.
Downloaded original interface of MinGW but i was not able to find GTK extensions and some binutils.

[shady_inc]

Originally Posted by QwertyManiac

Oh and by the way, using unconditional logic jumps ala GoTo is a very bad programming practice.

Hmmm....I find goto quite helpful in the program I have posted..What is the other alternative to it??

Also,How is microsoft visual C++..Better or worse than Dev-C++???

[timemachine]

Depends upon the requirement of the project.... if i would have to choose, i would have chosen Dev C++. But Visual C++ is also good, but difficult to learn however.

[The_Devil_Himself]

yea man dev c++ looks more geeky(hence cool).Lols.dev c++ is light on resources and thats very important for a IDE.

[timemachine]

Well about looks, it depends person to person. Well i like the UNIX enviornment and the traditional black and white screen for programming. Lotzz of libraries and binutils and a great satisfaction. May vary from person to person

[Ankur Gupta]

Originally Posted by shady_inc

Hmmm....I find goto quite helpful in the program I have posted..What is the other alternative to it??

Also,How is microsoft visual C++..Better or worse than Dev-C++???

Making a function is a much better way to implement goto statement...
Never use goto statement...it is a very inefficient way of programming...

[ayush_chh]

Here is program to insert a node in a singly linked list. The program works fine but it gives a warning 'the code is unusable' and if i remove this(bolded part) then the program doesn't work........

/* Inserting a node into a singly Linked List*/

#include<stdio.h>
#include<conio.h>
struct list
{
 int info;
 struct list *link;
};
typedef struct list node;
// create the list
void createlist(node *n)
{
 char ch;
 printf("\n\nEnter the item (number only) to be inserted\n");
 scanf("%d",&n->info);
 printf("\nDo you want to continue(Y/N)\n");
 ch= getche();
 getch();
 if(ch=='y'|| ch=='Y')
 {
  n->link=(node *)malloc(sizeof(node));
  createlist(n->link);
 }
 else
 n->link=NULL;
}
void displaylist(node *n)
{
 node *n1;
 n1=n;
 if(n1!=NULL)
 {
  printf("%d\n",n->info);
  displaylist(n1->link);
 }
}
void insnode(node *n,int desti)
{
 int cnt=1;
 node *n1, *temp;
 n1=n;
 while(n1!=NULL)
 {
  cnt++;
  if(desti==1)
  {
   temp->link=(node *)malloc(sizeof(node));
   printf("\nEnter the item to be inserted\n");
   scanf("%d",&temp->info);
   temp->link=n1;
   n=temp;
   n1->link;
   printf("\nNode Inserted Successfully\n");
   printf("\nThe new Linked List elements are\n");
   break;
  }
  else if(desti==cnt)
  {
   temp->link=(node *)malloc(sizeof(node));
   printf("\nEnter the item to be inserted\n");
   scanf("%d",&temp->info);
   temp->link=n1->link;
   n1->link=temp;
   printf("\nNode Inserted Successfully\n");
   printf("\nThe new Linked List elements are\n");
   break;
  }
  n1=n1->link;
 }
 displaylist(n);
}
void main()
{
 node *start;
 int loc;
 clrscr();
 start->link=(node *)malloc(sizeof(node));
 printf("\nCreate a linked list :");
 createlist(start);
 printf("\n\nCreated linked list elements are:\n");
 displaylist(start);
 printf("\nEnter the position at which you want to add new node\n");
 scanf("%d",&loc);
 insnode(start,loc);
 getch();
}

[aditya.shevade]

Originally Posted by timemachine

MinGW : GTK facility is not available. Lacks of some libraries of gcc.
Downloaded original interface of MinGW but i was not able to find GTK extensions and some binutils.

^^ Yes.. but I am not sure if GTK is cross platform.... correct me if I am wrong. The man just wants to program C. And on any given day, using Linux and gcc is better than cygwin.

I have seen the roughs of cygwin. Using Linux is far better.

[timemachine]

Originally Posted by aditya.shevade

^^ Yes.. but I am not sure if GTK is cross platform.... correct me if I am wrong. The man just wants to program C. And on any given day, using Linux and gcc is better than cygwin.

I have seen the roughs of cygwin. Using Linux is far better.

You are right. But it is good for those who knows nothing about UNIX or LINUX systems and can't keep them as a OS because they know nothing. They only want to program with gcc and rest use the features of windows(because they love it). Besides the roughs of cygwin, it can be used for beginning, and then it is good to switch over unix or linux. A desktop linux like mandriva is easy to install, dual - boot , and use. And u r right, using Linux or unix with gcc is best. I use it on a seprate machine, windows on a seprate one.

[mehulved]

Originally Posted by aditya.shevade

^^ Yes.. but I am not sure if GTK is cross platform.... correct me if I am wrong. The man just wants to program C. And on any given day, using Linux and gcc is better than cygwin.

I have seen the roughs of cygwin. Using Linux is far better.

GTK is surely available on windows. There's gaim/pidgin and gimp both available for windows. The former surely makes use of GTK on Windows, not sure of the latter.

[Sykora]

GIMP definitely uses GTK2+ Environment. If I remember correctly, you are required to install it before installing the GIMP itself.

[shady_inc]

@ Sykora: You have maintained a excellent blog,buddy.

[Zeeshan Quireshi]

Originally Posted by The_Devil_Himself

^^thanks for confirming.Dev c++ has very good gui too.

dud then u seriously need to use Visual C++ Express or Eclipse . You'll forget DevC++ after using them .

Download Visual C++ 2005 Express Here [FREE]:
http://msdn2.microsoft.com/hi-in/express/aa700735.aspx

or you can down Eclipse C++ Developer Pack Here [FREE}:
http://www.eclipse.org/downloads/

The only problem with Eclipse is , t does not Bundle a Compiler with it . so you need to Install GCC(MinGW or Cygwin or DJGPP on Windows) before installing it and then configure it to use ur Installation of GCC , whereas Visual C++ 2005 Express bundles everything into a neat package .

[aditya.shevade]

Originally Posted by mehulved

GTK is surely available on windows. There's gaim/pidgin and gimp both available for windows. The former surely makes use of GTK on Windows, not sure of the latter.

hmm... I think I should do a little digging on it and see if I can program my project for this year in GTK and port it to windows..... Hoping for the best.

[ayush_chh]

pls help me out....and explain the cause of my warning.

[Sykora]

@shady_inc : Why thank you.

@ ayush_chh :
From what I've read of the insnode() function, the code is a mess.

For example, you're mallocing a block of memory at temp->link, without ever initializing temp.

The second thing is, the statement you've bolded, ie n1->link;, isn't supposed to do anything by itself. Perhaps you meant n1->link = temp or something?

EDIT : On further study, I think what you meant was :

if(desti==1)
  {
   temp=(node *)malloc(sizeof(node));
   printf("\nEnter the item to be inserted\n");
   scanf("%d",&temp->info);
   temp->link=n1;
   n=temp;
   /*n1->link;*/
   printf("\nNode Inserted Successfully\n");
   printf("\nThe new Linked List elements are\n");
   break;
  }

[quan chi]

well how to get the 40th fibonacci numer.
the below only calculates upto 20 i think.

#include<iostream.h>
int fib(int n);
int main
{int n,answer;
cout<<"enter a number"<<endl;
cin>>n;
answer=fib(n);
cout<<answer<<"is the"<<n<<"th fibonacci number"<,endl;
return(0);
}
int fib(int n)
{if(n<3)
{return(1);
}
else
{return(fib(n-2)+fib(n-1));
}
}

[Sykora]

^^^ Are you asking how to calculate up to the 40th, because you're unable to reach past 20? If that's the case, declare your variables as unsigned long, and then try it.

[Zeeshan Quireshi]

@quan_chi , it would me much more efficient(actually bout Infinitely Efficient) to solve the program iteratively rather than recursively .

Also u can use BNU Multi Precision library if you want to work with Infinite(literally) precision .
http://gmplib.org/

this way u can calculate as big as ur RAM allows to with no size restraints

[quan chi]

Originally Posted by Sykora

If that's the case, declare your variables as unsigned long, and then try it.

by that it dosent show any answer it freezes for some time and returns to the program page.

Originally Posted by Zeeshan Quireshi

@quan_chi , it would me much more efficient(actually bout Infinitely Efficient) to solve the program iteratively rather than recursively .

Also u can use BNU Multi Precision library if you want to work with Infinite(literally) precision .
http://gmplib.org/

this way u can calculate as big as ur RAM allows to with no size restraints

well can you please tell me in detail what it is and how to use it .

[aditya.shevade]

Originally Posted by Sykora

^^^ Are you asking how to calculate up to the 40th, because you're unable to reach past 20? If that's the case, declare your variables as unsigned long, and then try it.

I don't think that the 40th number might be above integer range.

[Gigacore]

[B] A C Program to convert decimal number to its Binary Number Equivalent

#include <stdio.h>
#include<conio.h>
void main()
{
	auto	int	dec, bin;
	int	dec_to_bin (int);
	printf("Enter a decimal number \n");
	scanf("%d", &dec);
	bin = dec_to_bin (dec);
	printf("The decimal number is = %d \n", dec);
	printf("The binary number is = %d \n", bin);
}
/*	Funtion to find the binary equivalent	*/
int	dec_to_bin (int d)
{
	auto	int	b,r,k;
		b=0;
		k=0;
		while(d>0)
		{
			r = d % 2;
			d = d / 2;
			b = b + r * k;
			k = k * 10;
		}
		return (b);
getch();
}

[Sykora]

You're better off writing the output binary number to a string rather than an int with digits 0 and 1. That way you'll be able to handle numbers above 31. Right now, the maximum binary number you can store is 11111, which is 31. Above that, and you'll get a wrap around.

[The_Devil_Himself]

^thats true but what if we are required to first covert 2 decimal no. into binary and then do some arithmatic calculation and then convert the result back to decimal?

[Sykora]

If you're that into Binary operations, you ought to be writing a class for binary numbers and overloading their operators. If you go that way, there's all sorts of cool things you can do. But that's in C++/Java/Python/Some other OO language.

If you want to stick with C, it is possible to write arithmetic functions over strings, but its slightly cumbersome.

[QwertyManiac]

Originally Posted by aditya.shevade

I don't think that the 40th number might be above integer range.

Yes its odd, an int actually displays numbers even upto the 47th Fibonacci value

A sample output from the program below:

38: 24157817
39: 39088169
40: 63245986
41: 102334155
42: 165580141
43: 267914296
44: 433494437
45: 701408733
46: 1134903170
47: 1836311903
48: -1323752223 (Goes wrong here onwards)

All this through an Integer variable whose max size is supposed to be 32768?! Or is it some kind of a clever compiler behavior, etc?

Here's the code which did the above:

#include<iostream>

using namespace std;

int main()
{
    int prev=0, fib=0, final=1;
    cout<<"1: "<<prev<<endl<<"2: "<<final<<endl;
    for(int i=0;i<=97;i++)
    {
        fib=final+prev;
        prev = final;
        final = fib;
        cout<<i+3<<": "<<fib<<endl;
    }
    cout<<endl<<"Final: "<<fib<<endl;
    return 0;
}

Doing the same with float yeilds right values upto 100, which would be the obvious way to do so correctly:

#include<iostream>

using namespace std;

int main()
{
    float prev=0, fib=0, final=1;
    cout.precision(30);
    cout<<"1: "<<prev<<endl<<"2: "<<final<<endl;
    for(int i=0;i<=97;i++)
    {
        fib=final+prev;
        prev = final;
        final = fib;
        cout<<i+3<<": "<<fib<<endl;
    }
    cout<<endl<<"Final: "<<fib<<endl;
    return 0;
}

Oddly, using long int results in the same execution as int itself, with numbers crapping out at 48th value and above.

[Sykora]

Qwerty, compile and run this code, and tell me what you get.

#include <iostream>
#include <limits>

using namespace std;

int main () {
	cout << "Data Type\t\tSize\t\tMinimum\t\t\tMaximum\n";
	cout << "char\t\t\t" << sizeof(char) << "\t\t" << CHAR_MIN << "\t\t\t" << CHAR_MAX << endl;
	cout << "short int\t\t" << sizeof(short int) << "\t\t" << SHRT_MIN << "\t\t\t" <<  SHRT_MAX << endl;
	cout << "int\t\t\t" << sizeof(int) << "\t\t" << INT_MIN << "\t\t" << INT_MAX << endl;
	cout << "long int\t\t" << sizeof(long int) << "\t\t" << LONG_MIN << "\t\t" << LONG_MAX << endl;
	cout << "unsigned char\t\t" << sizeof(unsigned char) << "\t\t" << '0' << "\t\t\t" << UCHAR_MAX << endl; 
	cout << "unsigned short\t\t" << sizeof(unsigned short) << "\t\t" << '0' << "\t\t\t" << USHRT_MAX << endl;
	cout << "unsigned int\t\t" << sizeof(unsigned int) << "\t\t" << '0' << "\t\t\t" << UINT_MAX << endl; 
	cout << "unsigned long\t\t" << sizeof(unsigned long) << "\t\t" << '0' << "\t\t\t" << ULONG_MAX << endl;
	return 0;
}

You're right, I'm getting the same values for INT_MAX and LONG_MAX. 32767 is for SHRT_MAX.

[The_Devil_Himself]

got this:

Data Type               Size            Minimum                 Maximum
char                    1               -128                    127
short int               2               -32768                  32767
int                     4               -2147483648             2147483647
long int                4               -2147483648             2147483647
unsigned char           1               0                       255
unsigned short          2               0                       65535
unsigned int            4               0                       4294967295
unsigned long           4               0                       4294967295

[QwertyManiac]

Am getting the same:

Data Type               Size            Minimum                 Maximum
char                    1               -128                    127
short int               2               -32768                  32767
int                     4               -2147483648             2147483647
long int                4               -2147483648             2147483647
unsigned char           1               0                       255
unsigned short          2               0                       65535
unsigned int            4               0                       4294967295
unsigned long           4               0                       4294967295

So my educational system is at fault?

[Sykora]

So it would seem. We'll only be able to tell if you run the same thing on TC++.