Question

using C language

Create a bitwise calculator that ask user for input two input, first int, bitwise operation, second int (i.e 5 & 9)

only those bitwise operation are allowed: & ~ ^ | << >>. If user uses wrong operators stop program and ask again.

Convert the first int and second int into 8 BITS binary (00000000) and use bitwise operator given by user to either AND, OR, XOR, etc (ie 1001 & 1111)

Answer 1

#include <stdio.h>

#define bits 8

int main(void) {

   // declare variables
   int a, b;
   char op;
   int binA[bits] = {0, 0, 0, 0, 0, 0, 0, 0}; 
   int binB[bits] = {0, 0, 0, 0, 0, 0, 0, 0};
   int res[bits];
    int i = bits - 1;
   int temp;


   // read numbers
   printf("Enter first operand: ");
   scanf("%d", &a);
   printf("Enter second operand: ");
   scanf("%d", &b);

   // read operator
   printf("Enter operation (&, ~, ^, |, <<, >>) (enter < for << and > for >>): ");
   scanf(" %c", &op);

   // operator validation
   while (op != '&' && op != '~' && op != '^' && op != '<' && op != '>' && op != '|') {
      printf("Invalid operation!!");

      printf("\nEnter operation (&, ~, ^, |, <<, >>) (enter < for << and > for >>): ");
      scanf("%c", &op);
   }
   

   // converting first number to binary
   temp = a;
    while (temp > 0) { 
        binA[i] = temp % 2; 
        temp = temp / 2; 
        i--;
    }

   // converting second number to binary
    i = bits - 1; 
   temp = b;
    while (temp > 0) { 
        binB[i] = temp % 2; 
        temp = temp / 2; 
        i--; 
    }


   // display the bits
   printf("\n%d in %d-bits binary = ", a, bits);
   for(i = 0; i < bits; i++) {
      printf("%d", binA[i]);
   }

   printf("\n%d in %d-bits binary = ", b, bits);
   for(i = 0; i < bits; i++) {
      printf("%d", binB[i]);
   }

   // apply the operation accordingly
   // and store the result in the res array
   if (op == '&') {
      for (i = 0; i < bits; i++) {
         res[i] = binA[i] & binB[i];
      }
   }
   else if (op == '^') {
      for (i = 0; i < bits; i++) {
         res[i] = binA[i] ^ binB[i];
      }
   }
   else if (op == '|') {
      for (i = 0; i < bits; i++) {
         res[i] = binA[i] | binB[i];
      }
   }
   else if (op == '<') {
      for (i = 0; i < bits; i++) {
         res[i] = binA[i] << binB[i];
      }
   }
   else if (op == '>') {
      for (i = 0; i < bits; i++) {
         res[i] = binA[i] >> binB[i];
      }
   }
   else {
      for (i = 0; i < bits; i++) {
         if (binA[i] == 1) {
            binA[i] = 0;
         }
         else {
            binA[i] = 1;
         }

         if (binB[i] == 1) {
            binB[i] = 0;
         }
         else {
            binB[i] = 1;
         }
      }
   }


   // display result 

   // if operation is ~ we display both numbres after applying ~ opertaion
   if (op == '~') {
      printf("\n\nResult\n");

      printf("~%d = ", a);
      for (i = 0; i < bits; i++) {
         printf("%d", binA[i]);
      }

      printf("\n~%d = ", b);
      for (i = 0; i < bits; i++) {
         printf("%d", binB[i]);
      }
   }
   
   else if (op == '<') {
      printf("\n\nResult\n");
      printf("%d << %d = ", a, b);
      for (i = 0; i < bits; i++) {
         printf("%d", res[i]);
      }
   }

   else if (op == '>') {
      printf("\n\nResult\n");
      printf("%d >> %d = ", a, b);
      for (i = 0; i < bits; i++) {
         printf("%d", res[i]);
      }
   }

   // else display the result
   else {
      printf("\n\nResult\n");
      printf("%d %c %d = ", a, op, b);
      for (i = 0; i < bits; i++) {
         printf("%d", res[i]);
      }
   }

   return 0;
}

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