migrating from turbo c++ to visual c++ 2008

here i am giving some tips for all those who are new to visual c++ 2008 and have decided to ditch turbo c++.if you are finding it difficult to run your old turbo c programs on visual c++ compiler,here are some tips to solve those frustrating compatibility issues.

the following tips originally suggested by bharat m urs. credit goes to him.

1. clrscr():

In turbo c,you had to include <conio.h> header.but in visual c++ it wont work.you have to include windows.h header.and system(“cls”); is the replacement code for clrscr()

2.iostream

the right way of declaring iostream.h header is “#include <iostream>” and not                                          #include<iostream.h>.other header files like stdio,conio works alike.

3.cout,cin,endl commands

to use these commands you have to namespace std.

the following source code of nqueen’s problem can get you a better idea.

4.getch()

use _getch() instead of getch()

more tips coming soon…

example program…….

/*nqueens*/

#include<iostream>
#include<conio.h>
#include<windows.h>

int count;
using namespace std;
using std::cout;
using std::cin;
using std::endl;

int abs(int n)
{
if(n<0)
n=-n;
return n;
}

int canplace(int k,int c[])
{
int i;
for(i=0;i<k;i++)
{
if(c[i]==c[k] || abs(c[i]-c[k])==abs(i-k))
return 0;
}
return 1;
}

void display(int n,int c[])
{
int i,j;
count++;
char q[100][100];
for(i=0;i<n;i++)
for(j=0;j<n;j++)
q[i][j]=’*';

for(i=0;i<n;i++)
q[i][c[i]]=’Q';

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
cout<<q[i][j]<<”  “;
}
cout<<endl;
}
}

void queen(int n)
{
int k,c[100];
c[0]=-1;
k=0;
while(k>=0)
{
c[k]++;
while(c[k]<n && !canplace(k,c))
c[k]++;

if(c[k]<n)
{
if(k==n-1)
{
cout<<”\nSolution Number “<<count+1<<” is\n”;
display(n,c);
cout<<”\n”;
}

else
{
k++;
c[k]=-1;
}
}
else
k–;
}
if(count==0)
{
cout<<”\nNo Solution !!”<<endl;
}
}

void main()
{
int n;
system(“cls”);
cout<<”\nEnter the number of queens : “;    cin>>n;
queen(n);
cout<<”\n\nThere are “<<count<<” solutions”;
_getch();
}