Question

Write a program in C language that lets a user manipulate bits individually in a 4-byte variable. The program should begin with all bits having a value of zero. The program should enter a loop where it prints out the current bit values as a single integer using the twos complement bit model. It should then prompt the user to either set a bit, clear a bit, or exit. If the user desires to set a bit or clear a bit, then the programshould prompt the user for which bit, change the appropriate value, and then cycle back to the beginning of the loop. Setting a bit changes its value to 1 regardless of its current value; clearing a bit changes its value to 0 regardless of its current value.

Answer 1

C program for manipulate bits individually in a 4-byte variable:

#include<stdio.h>
int main()
{
   int number = 0,i;
   int bit_position = 0;
   int choice;
   while(1)
       {
           for(i=31; i>=0; i--) {
           printf("%i",((number & (1 << i))?1:0));
           }
       printf("\nEnter 1. to set bit :");
       printf("\nEnter 2. to clear bit :");
       printf("\nEnter 3. to exit :");
       printf("\nEnter your choice :");
       scanf("%d",&choice);
       if(choice == 3) break;
       if(choice ==1 || choice == 2)
       {
           printf("\nEnter bit position to set or clear bit :");
           scanf("%d", &bit_position);
       }
       if(choice == 1)
       number |= 1 << bit_position;
       if(choice == 2)
       number &= ~(1 << bit_position);
   }
   return 0;
}