CHEQUE THE IP ADRESS PROGRAME

CHEQUE THE IP ADRESS PROGRAME;

CHEQUE THE IP ADRESS PROGRAME


C programming code;


#include<stdlib.h> main(){   system("C:\\Windows\\System32\\ipconfig");   system("pause");    return 0;}
IP address program executable.Output of program: ( In Windows XP )

PROGRAME OF STRING

PROGRAME OF STRING

strlwr, strupr in c 




Here we will change string case with and without strlwr, strupr functions.


strlwr in c

#include<stdio.h>
#include<string.h>
 
main()
{
    char string[] = "Strlwr in C";
 
    printf("%s\n",strlwr(string));
 
    return  0;
}


strupr in c

#include<stdio.h>
#include<string.h>
 
main()
{
    char string[] = "strupr in c";
 
    printf("%s\n",strupr(string));
 
    return  0;
}


Change string to upper case without strupr

#include<stdio.h>
 
void upper_string(char*);
 
main()
{
   char string[100];
 
   printf("Enter a string to convert it into upper case\n");
   gets(string);
 
   upper_string(string);
 
   printf("Entered string in upper case is \"%s\"\n", string);
 
   return 0;
}
 
void upper_string(char *string)
{
   while(*string)
   {
       if ( *string >= 'a' && *string <= 'z' )
       {
          *string = *string - 32;
       }
       string++;
   }
}


Change string to lower case without strlwr

#include<stdio.h>
 
void lower_string(char*);
 
main()
{
   char string[100];
 
   printf("Enter a string to convert it into lower case\n");
   gets(string);
 
   lower_string(string);
 
   printf("Entered string in lower case is \"%s\"\n", string);
 
   return 0;
}
 
void lower_string(char *string)
{
   while(*string)
   {
      if ( *string >= 'A' && *string <= 'Z' )
      {
         *string = *string + 32;
      }
      string++;
   }
}

C programming code for binary search

C programming code for binary search

#include<stdio.h>
 
main()
{
   int c, first, last, middle, n, search, array[100];
 
   printf("Enter number of elements\n");
   scanf("%d",&n);
 
   printf("Enter %d integers\n", n);
 
   for ( c = 0 ; c < n ; c++ )
      scanf("%d",&array[c]);
 
   printf("Enter value to find\n");
   scanf("%d",&search);
 
   first = 0;
   last = n - 1;
   middle = (first+last)/2;
 
   while( first <= last )
   {
      if ( array[middle] < search )
         first = middle + 1;    
      else if ( array[middle] == search ) 
      {
         printf("%d found at location %d.\n", search, middle+1);
         break;
      }
      else
         last = middle - 1;
 
      middle = (first + last)/2;
   }
   if ( first > last )
      printf("Not found! %d is not present in the list.\n", search);
 
   return 0;   
}

Matrix multiplication in c language

Matrix multiplication in c language

#include <stdio.h>
 
int main()
{
  int m, n, p, q, c, d, k, sum = 0;
  int first[10][10], second[10][10], multiply[10][10];
 
  printf("Enter the number of rows and columns of first matrix\n");
  scanf("%d%d", &m, &n);
  printf("Enter the elements of first matrix\n");
 
  for (  c = 0 ; c < m ; c++ )
    for ( d = 0 ; d < n ; d++ )
      scanf("%d", &first[c][d]);
 
  printf("Enter the number of rows and columns of second matrix\n");
  scanf("%d%d", &p, &q);
 
  if ( n != p )
    printf("Matrices with entered orders can't be multiplied with each other.\n");
  else
  {
    printf("Enter the elements of second matrix\n");
 
    for ( c = 0 ; c < p ; c++ )
      for ( d = 0 ; d < q ; d++ )
        scanf("%d", &second[c][d]);
 
    for ( c = 0 ; c < m ; c++ )
    {
      for ( d = 0 ; d < q ; d++ )
      {
        for ( k = 0 ; k < p ; k++ )
        {
          sum = sum + first[c][k]*second[k][d];
        }
 
        multiply[c][d] = sum;
        sum = 0;
      }
    }
 
    printf("Product of entered matrices:-\n");
 
    for ( c = 0 ; c < m ; c++ )
    {
      for ( d = 0 ; d < q ; d++ )
        printf("%d\t", multiply[c][d]);
 
      printf("\n");
    }
  }
 
  return 0;
}

A 3 X 3 matrix multiply in c is shown as example below.

Compiler used: 

GCC

Output of program: 

SUBSTRACT MATRIX IN PROGRAMMING C;

SUBSTRACT MATRIX IN PROGRAMMING C;

Subtract matrices

C code to subtract matrices of any order. This program finds difference between corresponding elements of two matrices and then print the resultant matrix.

C programming code

#include<stdio.h>
 
int main()
{
  int m, n, c, d, first[10][10], second[10][10], difference[10][10];
 
  printf("Enter the number of rows and columns of matrix\n");
  scanf("%d%d", &m, &n);
  printf("Enter the elements of first matrix\n");
 
  for (c = 0; c < m; c++)
    for (d = 0 ; d < n; d++)
      scanf("%d", &first[c][d]);
 
  printf("Enter the elements of second matrix\n");
 
  for (c = 0; c < m; c++)
    for (d = 0; d < n; d++)
        scanf("%d", &second[c][d]);
 
  for (c = 0; c < m; c++)
    for (d = 0; d < n; d++)
      difference[c][d] = first[c][d] - second[c][d];
 
  printf("difference of entered matrices:-\n");
 
  for (c = 0; c < m; c++)
  {
    for (d = 0; d < n; d++)
      printf("%d\t",difference[c][d]);
 
    printf("\n");
  }
 
  return 0;
}

SHUT DOWN OF YOUR COMPUTER PROGRAME

SHUT DOWN OF YOUR COMPUTER PROGRAME

C programming code for Windows XP

#include <stdio.h>
#include <stdlib.h>
 
main()
{
   char ch;
 
   printf("Do you want to shutdown your computer now (y/n)\n");
   scanf("%c",&ch);
 
   if (ch == 'y' || ch == 'Y')
      system("C:\\WINDOWS\\System32\\shutdown -s");
 
   return 0;
}

C programming code for Windows 7

#include <stdio.h>
#include <stdlib.h>
 
main()
{
   char ch;
 
   printf("Do you want to shutdown your computer now (y/n)\n");
   scanf("%c",&ch);
 
   if (ch == 'y' || ch == 'Y')
      system("C:\\WINDOWS\\System32\\shutdown /s");
 
   return 0;
}

To shutdown immediately use "C:\\WINDOWS\\System32\\ shutdown /s /t 0". To restart use /r instead of /s.

C programming code for Ubuntu Linux

#include <stdio.h>
 
int main() {
  system("shutdown -P now");
  return 0;
} 

You need to be logged in as root user for above program to execute otherwise you will get the message shutdown: Need to be root, now specifies that you want to shutdown immediately. '-P' option specifes you want to power off your machine. You can specify minutes as:
shutdown -P "number of minutes"
For more help or options type at terminal: man shutdown

C programming code to swap using bitwise XOR

C programming code to swap using bitwise XOR

#include <stdio.h>
 
int main()
{
  int x, y;
 
  scanf("%d%d", &x, &y);
 
  printf("x = %d\ny = %d\n", x, y);
 
  x = x ^ y;
  y = x ^ y;
  x = x ^ y;
 
  printf("x = %d\ny = %d\n", x, y);
 
  return 0;
}

Swapping numbers using call by reference

Swapping numbers using call by reference

In this method we will make a function to swap numbers.

#include <stdio.h>
 
void swap(int*, int*);
 
int main()
{
   int x, y;
 
   printf("Enter the value of x and y\n");
   scanf("%d%d",&x,&y);
 
   printf("Before Swapping\nx = %d\ny = %d\n", x, y);
 
   swap(&x, &y); 
 
   printf("After Swapping\nx = %d\ny = %d\n", x, y);
 
   return 0;
}
 
void swap(int *a, int *b)
{
   int temp;
 
   temp = *b;
   *b = *a;
   *a = temp;   
}

Swap two numbers using pointers

Swap two numbers using pointers

#include <stdio.h>
 
int main()
{
   int x, y, *a, *b, temp;
 
   printf("Enter the value of x and y\n");
   scanf("%d%d", &x, &y);
 
   printf("Before Swapping\nx = %d\ny = %d\n", x, y);
 
   a = &x;
   b = &y;
 
   temp = *b;
   *b = *a;
   *a = temp;
 
   printf("After Swapping\nx = %d\ny = %d\n", x, y);
 
   return 0;
}

Swapping of two numbers without third variable

Swapping of two numbers without third variable

You can also swap two numbers without using temp or temporary or third variable. In that case c program will be as shown :-

#include <stdio.h>
 
int main()
{
   int a, b;
 
   printf("Enter two integers to swap\n");
   scanf("%d%d", &a, &b);
 
   a = a + b;
   b = a - b;
   a = a - b;
 
   printf("a = %d\nb = %d\n",a,b);
   return 0;
}

To understand above logic simply choose a as 7 and b as 9 and then do what is written in program. You can choose any other combination of numbers as well. Sometimes it's a good way to understand a program.