Question

You have to write a program that will read a number followed by a series of bit operations from a file and perform the given operations sequentially on the number.
The operations are as follows:
set(x, n, v) sets the nth bit of the number x to v
comp(x, n) sets the value of the nth bit of x to its complement (1 if 0 and 0 otherwise)
get(x, n) returns the value of the nth bit of the number x
The least significant bit (LSB) is considered to be index 0.
Input format: Your program will take the file name as input. The first line in the file provides the value of the number x to be manipulated. This number should be considered an unsigned short. The following lines will contain the operations to manipulate the number. To simplify parsing, the format of the operations will always be the command name followed by 2 numbers, separated by tabs. For the set(x, n, v) command, the value of the second input number (v) will always be either 0 or 1. For the comp(x, n) and get(x, n) commands the value of the second input number will always be 0 and can be ignored. Note that the changes to x are cumulative, rather than each instruction operating independently on the original x.
Output format: Your output for comp and set commands will be the resulting value of the number x after each operation, each on a new line. For get commands, the output should be the requested bit’s value.
Example Execution:
For example, a sample input file "file1.txt" contains the following (except the annotation comments):
5 ---------------------------------# x = 5
get 0 0 -------------------------# get(x, 0), ignoring second value (0)
comp 0 0 ----------------------# comp(x, 0), ignoring second value (0)
set 1 1 --------------------------# set(x, 1, 1)
The result of the sample run is:
$ ./first file1.txt
1
4
6

Answer 1

The program what will read a number followed by a series of bit operations from file and perform the given operations sequentially on the number is given below.

What is an operation in computer science?

An operation, in mathematics and computer programming, is an action that is carried out to accomplish a given task.

There are five basic types of computer operations:

• Inputting,
• processing,
• outputting,
• storing, and
• controlling.

What is the requested program above?

#include <stdio.h>

#include <fcntl.h>

int main(int argc, char *argv[])

{

  int number, n, v, temp;

  char line[25], fun[10];

  FILE *f = fopen(argv[1], "r");

 

  fgets(line, 24, f);

  sscanf(line, "%d", &number);   //reading the number

  while( fgets(line, 24, f) )

   {

      sscanf(line, "%s %d %d", fun, &n, &v); //reading the commands

      switch(fun[0])           //checking which command to run

      {

          case 'g':    temp = 1;

                      temp = temp<<n;   //shifting for getting that bit

                      printf("%d\n",(number&temp)&&1);

                      break;

          case 's':   temp = 1;

                      temp = temp<<n;   //shifting for setting that bit

                      if(!v)

                      {

                          temp = ~temp;

                          number = number & temp;

                      }

                      else

                      {

                          number = number | temp;

                      }

                      printf("%d\n",number);

                      break;

          case 'c':   temp = 1;

                      temp = temp<<n;   //shifting for complimenting that bit

                      number = number ^ temp;   //xor to complement that bit

                      printf("%d\n",number);

                      break;

          default:printf("not defined");

      }

  }

  return 0;

}

Execution and Output:

terminal-> $ gcc -o first first.c

terminal-> $ ./first file1.txt

1

4

6

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