C > C on Unix

Cryptography in c on linux

Cryptography in c on linux

#include<stdio.h>
int main()
{unsigned long int i=0;
 char ch;
 char name1[20],name2[20];
 FILE *fp,*ft;
 printf("ENTER THE SOURCE FILE:");
 gets(name1);
 printf("ENTER THE DESTINATION FILE:");
 gets(name2);
 fp=fopen(name1,"r");
 ft=fopen(name2,"w");
 if(fp==NULL)
 {printf("CAN,T OPEN THE FILE");
  }
 while(!feof(fp))
 {ch=getc(fp);
  ch=~((ch^i));
  i+=2;
  if(i==100000)
  {i=0;
   }
  putc(ch,ft);
  }
  fclose(fp);
  fclose(ft);
  return 0;
}