EMPTY RECYCLE BIN USING C PROGRAM


/*Source code of C program--EMPTY RECYCLE BIN*/

#include<stdio.h>


#include<windows.h>

#include<shlobj.h>

#define WIN32_LEAN_AND_MEAN




int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
if(MessageBox(NULL, "Press ok to empty the Recycle Bin.", "recycler", MB_YESNO | MB_ICONINFORMATION) != IDYES)
return FALSE;
SHEmptyRecycleBin(NULL, "", 0);
return FALSE ;
}

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Small C Program-Convert IP address to it's base10 form

/*SOURCE CODE OF SIMPLE PROGRAM--CONVERT IP ADRESS TO IT'S BASE10 FORM*/
#include<stdio.h>
#include<getopt.h>

#include<sys/types.h>
#include<locale.h>
#include<regex.h>




#define PACKAGE "ip2b10"
#define VERSION "0.0.2"
#define URL     "WWW"
#define IPEXPR  "([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})"


void print_help(int exval);
void print_version(int exval);


int main(int argc, char *argv[]) {
 regex_t re;
 int opt = 0;
 int print_flag = 0;
 long unsigned int result = 0;
 int var1 = 0, var2 = 0;
 int var3 = 0, var4 = 0;


 /* any options given ? */
 if(argc == 1)
  print_help(1);
 /* option parser */
 while((opt = getopt(argc, argv, "hvxa")) != -1) {
  switch(opt) {
   case 'h': /* print this help and exit */
    print_help(0);
   case 'v': /* print program version and exit */
    print_version(0);
   case 'x': /* output in Hex.. */
    print_flag = 1;
    break;
   case 'a': /* output some additional info... */
    print_flag = 2;
    break;
   case '?': /* no such option */
    fprintf(stderr, "%s: Error - No such option: `%c'\n\n", PACKAGE, optopt);
    print_help(1);
  }
 }


 /* enough options left ? */
 if((argc - optind) == 0)
  print_help(1);
 /* compile regular expression */
 if(regcomp(&re, IPEXPR, REG_EXTENDED) != 0) {
  fprintf(stderr, "%s: Error - compiling regular expression..\n", PACKAGE);
  return 1;
 }
 /* while parsing remaining opts.. */
 for(; optind < argc; optind++) {
  /* very basic test of ip4 dotted quad address format */
  if(regexec(&re, argv[optind], 0, NULL, 0) != 0) {
   fprintf(stderr, "%s: Error - `%s'; not a ip4 dotted quad..\n" , PACKAGE, argv   [optind]);  
   continue;
  }
  /* read address */
  scanf(argv[optind], "%d.%d.%d.%d", &var1, &var2, &var3, &var4);
  /* convert address to base 10 */
  result = (var1 << 24) + (var2 << 16) + (var3 << 8) + var4;
  /* output the results */
  if(print_flag == 0)
   printf("%lu\n", result);
  else if(print_flag == 1)
   printf("%0lx\n", result);
  else {
   printf("%%\n");
   printf("ip addr : %s\n", argv[optind]);
   printf("formula : %d * (256^3) + %d * (256^2) + %d * 256 + %d\n", 
     var1, var2, var3, var4);
   printf("base10  : %lu\n", result);
   printf("hex     : %0lx\n", result);
  }
 }
 return 0;
}
void print_help(int exval) {
 printf("%s,%s convert an IP address to its base10 form\n", PACKAGE, VERSION);
 printf("Usage: %s [-h] [-v] [-x] [-a] IP IP..\n\n", PACKAGE);


 printf(" -h        print this help and exit\n");
 printf(" -v        print version and exit\n");
 printf(" -x        print address in Hexadecimal\n");
 printf(" -a        print additional info\n\n");


 printf(" Please note, this is valid for IP version 4 addresses only!\n");
 exit(exval);
}
/* print version and exit with exval */
void print_version(int exval) {
 exit(exval);
}



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Switch Case Statement in C

                    The switch case statement allows you to select from multiple choice based on a set of fixed value for a give expression.The value of the variable given into switch is compared to the value following each of the cases.And when one value matches the value of the variable,the computer continues executing the program from that point.

Syntax of the 'switch case' statement is:

switch(expression)

{

case value1:  /*execute code1*/

break;

case value2: /*execute code2*/

break;

.....

default: /*execute default action*/

break;

}

Example:

/*Program to convert number into word*/

#include<stdio.h>

void main()

{

int num;

printf("Enter a number:\n");

scanf("%d",&num);

switch(num)

{

case 1:

printf("ONE!\n");

break;

case 2:

printf("TWO!\n");

break;

case 3:

printf("THREE!\n");

break;

case 4:

printf("FOUR!\n");

break;

case 5:

printf("FIVE!\n");

break;

case 6:

printf("SIX!\n");

break;

case 7:

printf("SEVEN!\n");

break;

case 8:

printf("EIGHT!\n");
break;

case 9:

printf("NINE!\n");

break;

case 0:

printf("ZERO!\n");

break;

default:

printf("Invalid Number!\n");

break;

}

getch();

}

In the switch case statement,the selection is determined by the value of an expression that you specify,which is enclosed between the parentheses after the keyword switch.The data type of value which is returned by expression must be an integer value otherwise the statement will not compile.when a break statement is executed,it causes execution to continue with statement following the closing brace for switch.The default statement is the default choice of the switch statement if all cases statement are not satisfy with expression.

More example using 'switch case' statement:

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