Question

Write a C/C++ program that reads a 8-bit value from the screen, calculate the CRC-16 result, and print it on the screen.

The input can be any 8-bit value in the hexadecimal form(with or without Ox), e.g., Al for 10100001

The output can be either in hexadecimal or binary form.

The initialization bits are all ones.

The result XoR bits are all ones

The code should be well commented

Do not use existing packages

Answer 1

#include <stdio.h>

#define MAX 1000

int main()

{

    char binarynum[MAX], hexa[MAX];

    long int i = 0;

    printf("Enter the value for hexadecimal ");

    scanf("%s", hexa);

    printf("\n Equivalent binary value: ");

    while (hexa[i])

    {

        switch (hexa[i])

        {

        case '0':

            printf("0000"); break;

        case '1':

            printf("0001"); break;

        case '2':

            printf("0010"); break;

        case '3':

            printf("0011"); break;

        case '4':

            printf("0100"); break;

        case '5':

            printf("0101"); break;

        case '6':

            printf("0110"); break;

        case '7':

            printf("0111"); break;

        case '8':

            printf("1000"); break;

        case '9':

            printf("1001"); break;

        case 'A':

            printf("1010"); break;

        case 'B':

            printf("1011"); break;

        case 'C':

            printf("1100"); break;

        case 'D':

            printf("1101"); break;

        case 'E':

            printf("1110"); break;

        case 'F':

            printf("1111"); break;

        case 'a':

            printf("1010"); break;

        case 'b':

            printf("1011"); break;

        case 'c':

            printf("1100"); break;

        case 'd':

            printf("1101"); break;

        case 'e':

            printf("1110"); break;

        case 'f':

            printf("1111"); break;

        default:

            printf("\n Invalid hexa digit %c ", hexa[i]);

            return 0;

        }

        i++;

    }

    return 0;

}

Program Explanation

1. Take a hexadecimal number as input and store it in the array hexa.
2. Using switch statement access each bit of the hexadecimal number and print its equivalent binary number in a four bit fashion as shown in the program.
3. Do step 2 for every bit of a input number. Use while loop to do this.

Runtime Test Cases

Output:

Enter the value for hexadecimal a1

Equivalent binary value: 10100001