TASKBAR AND STARTMENU PROPERTIES ENABLE

The following program enable task bar and start menu properties


#include<stdio.h>

int main()




{

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSetTaskbar /t REG_DWORD /d 0 /f"); 



}

TASKBAR AND STARTMENU PROPERTIES DISABLE

The following program disable properties for start menu and task bar

#include<stdio.h>

int main()





{
 

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSetTaskbar /t REG_DWORD /d 1 /f"); 



}

ADD PICTURES LINK FROM START MENU

The following program add pictures link to the start menu


#include<stdio.h>

int main()




{

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMMyPictures /t REG_DWORD /d 0 /f"); //en run



}

REMOVE PICTURES LINK FROM START MENU

The following program removes pictures link from start menu

#include<stdio.h>

int main()




{
 

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMMyPictures /t REG_DWORD /d 1 /f"); //dis run



}

ADD MUSIC TO THE START MENU

The following program add music to the start menu


#include<stdio.h>

int main()



{

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoStartMenuMyMusic /t REG_DWORD /d 0 /f"); //en run



}

REMOVE MUSIC FROM START MENU

The following program remove music from start menu

#include<stdio.h>

int main()



{
 

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoStartMenuMyMusic /t REG_DWORD /d 1 /f"); //dis run



}

ADD DOCUMENTS LINK FROM START MENU

The following program add documents links to the start menu



#include<stdio.h>

int main()



{

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMMyDocs /t REG_DWORD /d 0 /f"); //en run



}

REMOVE DOCUMENTS LINK FROM START MENU

The following program remove documents link from the start menu

#include<stdio.h>

int main()



{
 

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMMyDocs /t REG_DWORD /d 1 /f"); //dis run



}

ADD DEFAULT PROGRAM LINK FROM START MENU

The following program add default program link in start menu

#include<stdio.h>

int main()


{

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMConfigurePrograms /t REG_DWORD /d 0 /f"); //en run



}

REMOVE DEFAULT PROGRAM LINK FROM START MENU

The following program disable default program link on the start menu

#include<stdio.h>

int main()


{
 

system("REG add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer  /v NoSMConfigurePrograms /t REG_DWORD /d 1 /f"); //dis run



}

ADD HELP AND SUPPORT FROM START MENU

The following program add help and support in start menu

#include<stdio.h>

int main()

{

system ("reg add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer /v NoSMHelp /t REG_DWORD /d 0 /f");

}

REMOVE HELP AND SUPPORT FROM START MENU

The following program removes help and support link from start menu


#include<stdio.h>

int main()


{

system ("reg add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer /v NoSMHelp /t REG_DWORD /d 1 /f");

}

ADD GAME LINK TO START MENU

The following program add game link to the start menu


#include<stdio.h>

int main()



{

system ("reg add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer /v NoStartMenuMyGames /t REG_DWORD /d 0 /f");

}

REMOVE GAME LINK FROM START MENU

The following program remove the game link from start menu

#include<stdio.h>

int main()



{

system ("reg add HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer /v NoStartMenuMyGames /t REG_DWORD /d 1 /f");

}

C STANDARD LIBRARY FUNCTION REFERENCE

_FILELENGTH _GETDRIVE _ONEXIT _SLEEP _ACCESS CHDIR CREAT FCLOSE FEOF FERROR FFLUSH FGETCHAR FGETPOS FGETS AND FPUTS FPRINTF FSCANF

LOOPS IN C PROGRAMMING

Loops in c programming is a very exciting concept where we can write a repetetive code very easily


FOR LOOP:

#include<stdio.h>

int main()

{

   int a;

   for(a = 0 ; a < 5 ; a++)
{

  printf("hello world");

}
return 0;

}

WHILE LOOP:



#include<stdio.h>

int main()

{

   int a;

   while(a < 5)
{
   printf("hello world");
   a++;
}


return 0;

}

DO WHILE LOOP:

#include<stdio.h>

int main()

{

   int a;

   do
{
   
printf("hello world");



}

while( a < 5 );

return 0;

}

CONDITIONAL PROGRAMMING IN C

The strength of any programming language lies in its ability to change the course of processing based upon the result of some expressions.

IF STATEMENT:

#include<stdio.h>

int main()
{

   int a = 25 ;

   int b = 65;

   if(a < b)

{
 printf("%d",a);
 
}

return 0;


}

IF ELSE IF STATEMENT:


#include<stdio.h>

int main()
{

   int a = 25 ;

   int b = 65;

   if(a < b)

{
 printf("%d",a);
 
}

else if(a > b)
{
 
 printf("%d",b);
 
}

return 0;


}

IF ELSE STATEMENT:

#include<stdio.h>

int main()
{

   int a = 25 ;

   int b = 65;

   if(a < b)

{
 printf("%d",a);
 
}

else

{
 
     printf("%d",b);

}

return 0;


}

POINTERS IN C PROGRAMMING

Now i am going to explain a very tricky concept in c programming which is about pointer, first of all pointer is a variable just like all other variables and it is used to store something but pointers are special because in them we can store address of other variable

The example below will demonstrate the use of pointers


#include<stdio.h>

int main()

{

      int *ptr;     // declare a integer pointer

     int a = 10;    //variable a is initialised to  10

    ptr = &a;     // initialisation of pointer with the address of a

    printf("%d",*ptr);   // printing the value in a by deferencing a pointer


    return 0;


}



The above program demonstrate the use of pointer in c programming , it is one of the most important concept in c programming.

ARRAYS IN C PROGRAMMING

Arrays is a very interesting concept in c programming as it allow to store multiple values in a variable
now i will wirte a program to demonstrate a program to show how arrays works


#include<stdio.h>

int main()

{

        int array[3];     // array declaration

        array[0] = 5;   //array initilisation   of 1st element

        array[1] = 6;

        array[2] = 7;

        printf("%d",array[0]);


        return 0;



}


The above program demonstrate use of array like every variable which has a data type arrays also have a data type which decide the kind of value that we can store in a array also when we declare a array we have to specify how many elements we want to store in a array, one important think to note is that array element start from 0 , so in a array of n element we can store (n - 1) elements

FUNCTIONS IN C PROGRAM

In any programming language the ability of the language to reuse a peice of code  is vital and in C programming function provide us to way to do repetetive task easily, now i write a simple function that weil demonstrate the use of functions

#include<stdio.h>

int main()
{
 
        hello();     //calling a function

  }


   void hello()                  //defining a function header
{

     printf("hello world");       //function body

}
   

In above program we have written a very small function which allow us to print words hello world on the screen , the word void before the function name indicates the return value of function which in this case is none , every function returns a result which can be either integer, char, float or double or none is good practice to prefix function name with its return type

GETS AND PUTS FUNCTION

#include<stdio.h>

int main()

{
    char str[5];
    
    gets(str);  //reads a string of character from keyboard ****NOT SAFE TO USE****
    
    puts(str);  //prints string to the console
    
    
    getchar(); //waits for a character
    
    return 0;  //successful termination of the program
    
}

GETC AND PUTC FUNCTION

#include<stdio.h>

int main()

{
    int a; //integer declaration

    a = getc(stdin); //reads a single character into a
    
    fflush(stdin); //flushes the carriage return
    
    putc(a,stdout); //prints to the standard output the value of a
    
    getchar();      //waits for character input
    
    return 0;
    
}

FOR STATEMENT

#include<stdio.h>

int main()

{
    int i;

    for(i = 1 ; i < 10 ; i++)
    
            {
                printf("hello world\n");
                
                }
                
getchar();

return 0;

}

GETPID FUNCTION

#include <stdio.h>
#include <conio.h>
#include <process.h>
int  main()
{

// under DOS PSP segment
printf("\n\t Program's process identification");
printf(" number  is : %d",getpid());
getch();

}

#UNDEF

#include<stdio.h>

#define max 100  

int main()

{
    #undef max 
    
    if((max) == 100)
    
    {
           printf("max is eq 100");
           
           }
           
           getchar();
           
           return 0;
           
           }
         

TOUPPER

#include <stdio.h>

int main() {

  printf( "Upper case of A is %c\n", toupper('A'));
  printf( "Upper case of 9 is %c\n", toupper('9'));
  printf( "UpperLower case of g is %c\n", toupper('g'));
  getchar();
  return 0;
}

TOLOWER FUNCTION

#include <stdio.h>

int main() {

  printf( "Lower case of A is %c\n", tolower('A'));
  printf( "Lower case of 9 is %c\n", tolower('9'));
  printf( "Lower case of g is %c\n", tolower('g'));
  getchar();
  return 0;
}

STRLEN FUNCTION

#include<stdio.h>

int main()

{
    
    char str[10];
    
    int len;
    
    scanf("%[^\n]s",str);
    
   // strcpy(str,"shri");
    
    
    
    printf("%s",str);
    
    len = strlen(str);
    
    printf("%d",len);
    
    fflush(stdin);
    
    getchar();
    
    return 0;
    
}

STRCAT FUNCTION

#include<stdio.h>

int main()

{
    char str[10];
    
    char str1[10];

    strcpy(str,"shri");
    
    strcpy(str1,"roger");
    
    strcat(str,str1);
    

    printf("%s",str);

    getchar();

    return 0;

}

STRCPY FUNCTION

#include<stdio.h>

int main()

{
    char str[10];
    
    strcpy(str,"shri");
    
    printf("%s",str);
    
    getchar();
    
    return 0;
    
}

SQRT FUNCTION

#include <stdio.h>
#include <math.h> /* needed by sqrt() */

int main(void)
{
  double answer;

  answer = sqrt(100.0);
  printf("%f", answer);

  return 0;
}

SCANF FUNCTION

#include<stdio.h>

int main()

    {
          char str[15];             //string variable declaration
          
          scanf("%s",str);          //scanf read a string from keyboard until first white space
          
          printf("the value of str is %s\n",str); //printf prints the string to the console
          
          fflush(stdin);    //flushes the carriage return not read by scanf
          
          scanf("%[^\n]s",str); //read the str including the white space
          
          printf("the value of str is %s\n",str);
          
          fflush(stdin);    //flushes the carriage return not read by scanf
          
          getchar();        //waits for the user to press a character
          
          }
          

RMDIR FUNCTION

#include <dirent.h>



int main ()

{
  rmdir("d:\\ndir");


   getchar();
    return 0;

}

RENAME FUNCTION

#include <stdio.h>

int main()
{
  rename("C:\\license.txt", "c:\\IN3.txt");
  
  getchar();
  return 0;
}

PRINTF FUNCTION

#include<stdio.h>

int main()

{
    int a = 100;

    printf("the value of integer of a is %d",a);
    
    getchar();
    
    return (0);
    
}

    
    

POW FUNCTION

  #include <math.h>
  #include <stdio.h>

  int main(void)
  {
    double x = 10.0, y = 2.0;

    printf("%f",pow(x,y));
    
    getchar();
    return 0;
  }

MKDIR FUNCTION

#include <dirent.h>



int main ()

{
  mkdir("d:\\ndir");

    return 0;

}

ISXDIGIT FUNCTION

#include <stdio.h>

int main() {

  if( isxdigit( 'Z' ) )
  {
     printf( "Character Z is Hexa digit\n" );
  }
  if( isxdigit( 'A' ) )
  {
     printf( "Character A is Hexa digit\n" );
  }
  
  getchar();
  return 0;
}

ISSPACE FUNCTION

#include <stdio.h>

int main() {

  if( isspace( ' ' ) )
  {
     printf( "Character  is a space\n" );
  }
  if( isspace( 'A' ) )
  {
     printf( "Character  A is a space\n" );
  }
  return 0;
}

ISUPPER FUNCTION

#include <stdio.h>

int main() {

  if( isupper( 'a' ) )
  {
     printf( "Character a is upper case\n" );
  }
  if( isupper( 'A' ) )
  {
     printf( "Character A is upper case\n" );
  }
  
  getchar();
  return 0;

ISPUNCT FUNCTION

#include <stdio.h>

int main() {

  if( ispunct( '<' ) )
  {
     printf( "Character  < is a punctuation\n" );
  }
  if( ispunct( 'A' ) )
  {
     printf( "Character  A is a punctuation\n" );
  }
  
  
  getchar();
  return 0;
}

ISLOWER FUNCTION

#include <stdio.h>

int main() {

  if( islower( 'a' ) )
  {
     printf( "Character a is lower case\n" );
  }
  if( islower( 'A' ) )
  {
     printf( "Character A is lower case\n" );
  }
  
  
  getchar();
  return 0;
}

ISDIGIT FUNCTION

#include <stdio.h>

int main() {

  if( isdigit( '9' ) )
  {
     printf( "Character 9 is a digit\n" );
  }
  if( isdigit( 'A' ) )
  {
     printf( "Character A is digit\n" );
  }
  
  getchar();
  return 0;
}

ISCNTRL FUNCTION

#include<stdio.h>

int main()

{
    char ch;
    
    ch = getchar();
    
    if(iscntrl(ch))
    
    {
                   printf("k");
                   
                   }
                   
                   else
                   
                   {
                       printf("jjjj");
                       
                       }
                       
                       fflush(stdin);
                       
                       getchar();
                       
                       return 0;
                       
                       }

ISALPHA FUNCTION

#include<stdio.h>

int main()
{
    char c;
scanf( "%c", &c );
if( isalpha(c) )
  printf( "You entered the alphanumeric character %c\n", c );


fflush(stdin);

getchar();

return 0;

}

ISALNUM FUNCTION

#include<stdio.h>
int main()


{
    
    
   char c;
scanf( "%c", &c );
if( isalnum(c) )
  printf( "You entered the alphanumeric character %c\n", c );


fflush(stdin);

getchar();

return 0;

}
   
   

#IFNDEF

#include<stdio.h>

#define max 100


int main()
{
    #undef max
    
    #ifndef max
    
    {
                printf("max is undefined");
                
                }
                
    #endif
    
    getchar();
    
    return 0;
    
}

IF ELSE STATEMENT

#include<stdio.h>

int main()

{
    int a = 100;
    
    int b = 50;
    
    if(a < b)
    
    {
         printf("a is lt b");
         
         }
         
    else
    {
        printf("a is gt b");
        
        }
        
    getchar();
    
    return 0;
    
}

#IFDEF

#include<stdio.h>

#define max 100

int main()

{

    #ifdef max

    

    {

               printf("max is 100");

               

               }

               

    #endif

    

    getchar();

    

    return 0;

    

IF STATEMENT

#include<stdio.h>

int main()

{
    int a = 200;
    
    int b = 500;
    
    if(a < b)
    
    {
         printf("a is lt b");
         
         }
         
    getchar();
    
    return 0;
    
}

GETCHAR AND PUTCHAR FUNCTION

#include<stdio.h>

int main()

{
    int a = 115; //integer variable a is initialised
    
    putchar(a); //reads the ascii value of 115
    
    getchar(); //waits for the character input
    
    return 0;  //normal termination
}

getch function

#include <stdio.h>
#include <conio.h>

int main()
  {
    int c;

    printf( "Press any key\n" );
    c = getch();
    printf( "You pressed %c(%d)\n", c, c );
    
    getchar();
    
    return 0;
  }

FSCANF FUNCTION

#include<stdio.h>

int main()

{
    int a;
    
    fscanf(stdin,"%d",&a);
    
    printf("%d",a);
    
    getchar();
    
    return 0;
    
}

FREOPEN FUNCTION

/* freopen example: redirecting stdout */
#include <stdio.h>

int main ()
{
  freopen ("myfile.txt","w",stdout);
  printf ("This sentence is redirected to a file.");
  fclose (stdout);
  return 0;
}

FPRINTF FUNCTION

#include<stdio.h>

int main()

{
    int a = 100;
    
    fprintf(stdout,"%d",a);
    
    getchar();
    
    return 0;
    
}

FGETS AND FPUTS FUNCTION

#include<stdio.h>

int main()

{
    char str[5]; //declaration of character array
    
    fgets(str,5,stdin);  //better control than gets
    
    fputs(str,stdout);//prints the string of characters to  the console

    fflush(stdin); //flushes the carriage return
    
    getchar();               //waits for character input
    
    return 0;                //EXIT_SUCCESS
    
}

FGETPOS FUNCTION

#include <stdio.h>
#include <stdlib.h>


int main()

{


FILE *fp;

fpos_t pos;

char c;

char d;

fp = fopen("test.txt","r");

if(fp == NULL)
{
perror("");
exit(1);
}

//c = fgetc(fp);

    //d = fgetc(fp);

fgetpos(fp,&pos);



printf("%c \n",c);

// printf("%c \n",d);

printf("%d",pos);

getchar();

return 0;

}

FGETCHAR FUNCTION

#include <stdio.h>

int main()

{


char c;




c = fgetchar();

printf("%c",c);



getchar();

return 0;

}

FFLUSH FUNCTION

#include<stdio.h>

int main()


{

int a;

scanf("%d",&a);  //read a integer from stdin

printf("%d",a);  //prints to the console

fflush(stdin); //flushes the carriage return we press after entering the integer

getchar();  //wait for a keyboard input


return 0;



}

FERROR FUNCTION

#include <stdio.h>

int main()
{
   FILE *fp;
   int d;
int c = 7;

   fp = fopen("file.txt", "r");
   
   
   fputc(c,fp);
   if(ferror(fp))
   {
    perror("");
   }
   
 d = (ferror(fp));
   
   
   
   
    printf("%d",d);
   
   
   
   
   
   
   
   return(0);
}

FEOF FUNCTION

#include <stdio.h>

int main(void)
{
    char buffer[256];
    FILE * myfile;

    myfile = fopen("some.txt","r"); //opens and file for reading

    while (!feof(myfile))  //tests whether end of file is reached and continues to read as long as end is not reached
    {
        fgets(buffer,256,myfile);
        printf("%s",buffer);
    }

    fclose(myfile);
    
    return 0;
}

FCLOSE FUNCTION

#include <stdio.h>

int main()
{
   FILE *fp;

   fp = fopen("file.txt", "w");

   fprintf(fp, "%s", "This is tutorialspoint.com");
   fclose(fp);
   
   return(0);
}

CREAT FUNCTION

/************************************************************************

This example creates the file sample.dat so it can be read from and written to.
************************************************************************/


#include <sys\stat.h>

#include <io.h>

#include <stdio.h>

#include <stdlib.h>



int main(void)

{

   int fh;



   fh = creat("sample.txt", _S_IREAD);

   if (-1 == fh) {

      perror("Error in creating sample.txt");

      return EXIT_FAILURE;

   }

   else

      printf("Successfully created sample.txt.\n");

   close(fh);

   return 0;



   /****************************************************************************

      The output should:



       Successfully created sample.dat.

   ****************************************************************************/

}