Bit Operators (& and, | or, ^ Xor)

a.c
main()
{
printf("%d\n",4 & 5);
}
 
Output
4
 

8 4 2 1

0

1

0

0

= 4

8 4 2 1

0

1

0

1

= 5

---------------------

8 4 2 1

0

1

0

0

= 4

 
a.c
main()
{
printf("%d\n", 4 | 2);
}
 
Output
6
 

8 4 2 1

0

1

0

0

= 4

8 4 2 1

0

0

1

0

= 2

---------------------

8 4 2 1

0

1

1

0

= 6

 
a.c
main()
{
printf("%d\n",4^2);
printf("%d\n",4^6);
printf("%d\n",2^6);
}
 
Output
6
2
4
 

8 4 2 1

0

1

0

0

= 4

8 4 2 1

0

0

1

0

= 2

---------------------

8 4 2 1

0

1

1

0

= 6

8 4 2 1

0

1

0

0

= 4

8 4 2 1

0

1

1

0

= 6

---------------------

8 4 2 1

0

0

1

0

= 2

8 4 2 1

0

0

1

0

= 2

8 4 2 1

0

1

1

0

= 6

---------------------

8 4 2 1

0

1

0

0

= 4

encrypt-decrypt.c
 
// Usage: encrypt-decrypt <sorc.file> <dest.file> <password>
 
#include<stdio.h>
main(int argc, char *argv[]) 
{
FILE *fpi,*fpo; 
char *p; int i;
p=argv[3];
fpi=fopen(argv[1],"rb");
fpo=fopen(argv[2],"wb");
 while((i=fgetc(fpi))!=-1)
 {
 i=i^*p;
 p++;
 if(*p==0)
 p=argv[3];
 fputc(i,fpo);
 }
}

C:\> encrypt-decrypt Orignal.doc Encrypt.doc password
 
C:\> encrypt-decrypt Encrypt.doc Orignal.doc password
 
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