[Arjun Vaghani]

 

/*simple program of file Handling*/

/*copy content of 1 file to another*/

 

#include<stdio.h>

main(int argc, char **argv)

{

 char ch;

 FILE *fp1,*fp2;

 

 if(argc!)

 {

   printf(“Invalid syntax: use: ./cpy <source_filename> <destinatin_filename>n”);

   return;

 }

 

 fp1=fopen(argv[1],”r”); 

 if(fp1==NULL)

 {

 printf(“source file does not existsn”);

 return;

 }

fclose(fp1);

 

 fp2=fopen(argv[2],”r”);

 if(fp2!=NULL)

 {

here: printf(“Ur file already exists..Do u want to overwrite? press y for yes and n for no:”);

      scanf(“%c”,&ch);

 

      if(ch==’n’||ch==’N’)

         return;

      else if(ch!=’y’&& ch!=’Y’)

      {

         printf(“Invalid choicen”);

         goto here;

      }

  fclose(fp2);

  while((ch=getchar())!=’n’); /*for clearing buffer*/

 }

 

 fp1=fopen(argv[1],”r”);

 fp2=fopen(argv[2],”w”);

 

 while((ch=fgetc(fp1))!=EOF)

 {

  fputc(ch,fp2);

 }

 fclose(fp1);

 fclose(fp2);

}

 

 

[Arjun Vaghani]

/*motor.c*/

/*try this out , it’s very simple*/

/*LCD is not necessary for L293D’s interfacing with AT89S52, So i have not given, but u can add that code separately*/

 

/*program-start*/

 

#include<reg51.h>

main()

{

while(1)

{

unsigned char t;

t=P1&0x0f;                             //read the data from port P1

switch(t)

{                                              /*block for taking action according to input*/

case 0x02:P2=0x85;            /*forward*/

 break;

case 0x04:P2=0x86;          /*left*/

 break;

case 0x06:P2=0x89;           /*right*/

 break;

case 0x08:P2=0x8A;        /*backward*/

 break;

case 0x05:P2=0x00;          /*stop*/

 break;

case 0x00:P2=0x00;       /*no input*/

 break;

}

}

}

 

/*In Diagram Shown Below, by Configuring Port P1 for Different Input Combinations , U can get the Action Performed by the DC Motor, i.e Desired Motion.*/

 

wysiwyg_imageupload:7864:

 

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