Question

Please help me with the following C Programming project. I am providing the code I used which needs to be reworked to add the following requirements. Here is my code

#include<stdio.h>

char input;

int main() {

int i = 0;

while (true){

scanf_s("%c", &input);

if (input == 'X')

break;

printf("%c", input);

}

return 0;

}

Here are the requirements for the code plus and additional note what the code should have.

Goals

• Understand the ASCII representation of character values.
• Understand how to convert ASCII hex character values into their decimal value.
• Utilize Boolean expressions.
• Utilize an assignment statement.

Problem

Create a C program that reads hexadecimal characters from input (0-9, A-F) and outputs the decimal value of the ASCII character read and the decimal value corresponding to the hexadecimal character read. Input should be read until the character 'X' is read on input.

Assume your input is only ASCII characters '0' - 'F', ending in 'X'.

Tasks

1. First, alter your code from the previous assignment to output the ASCII character read in as decimal (in the previous assignment you output it as a character just like it was read... hint %d is the format you need... also add \n so that the decimal number is on a single line).
2. Next, run the program and make sure the value output makes sense in terms of your ASCII chart in your book. Be sure to provide inputs from 0-9 and A-F. Note the decimal values to know what you need to do to convert them to their decimal values for the hexadecimal representation (e.g. '9' is 9 and 'A' is 10).  
3. Declare a global integer to hold the decimal value converted from the hex character read.
4. Next, write the code to convert '0' - '9' to 0 - 9 and 'A' - 'F' to 10 -15, setting the variable in the previous step. You'll need to have a condition to detect if the character read is '0' through '9' inclusive. You can just use an else clause if the character is not '0' - '9', assuming that it is then 'A' through 'F'. By doing this, we are assuming that the input is correct.
5. Output the value variable. You'll need to have a \n after you output the digit to put the converted value on a single line by itself too.

Example of what he would like to see but cannot use this code.

This was to indicate that you had a choice between the two (0-9 or A-F) as to which one you could use in your if statement and leave the other check to the else portion of the if statement.

Unfortunately, this was taken to indicate that you would use the OR (||) in the condition that you would write which would be wrong. The condition that you would typically write to determine if a character read in was between '0' and '9' inclusive would require an AND (&&).

So, you should have in your code something like this:

if (check for character being between '0' AND '9')
   calculation to set value = to the '0' - '9' value read in minus some value to turn it into a decimal value
else
   calculation to set value = to the 'A' - 'F' value read in minus some value to turn it into a decimal value

OR you can do this check

if (check for character being between 'A' AND 'F')
  calculation to set value = to the 'A' - 'F' value read in minus some value to turn it into a decimal value
else
  calculation to set value = to the '0' - '9' value read in minus some value to turn it into a decimal value

Answer 1

/*please refer below code, and copy paste it to some ide so that you can see comment and code clearly, Have a good day*/

#include <stdio.h>

int main(void) {
   char input; //declaring input variable to read from standard input
   while(1)
   {
       scanf("%c",&input);
       //if inputted characted is 'X' then we need to break loop
       if(input=='X')
       {
           break;
       }
       printf("You have entered %c\n",input); //demonstration purpose,you can delete it
       //if input is between '0' and '9'
       if(input>='0'&&input<='9')
       {
           // to find decimal value of the ASCII character read, we need to understand that all character are
           // mapped to some integer valuse,
           // so if we typecast given input to integer, it will give us decimal of ascii character
           int ascii_decimal = (int) input;
           printf("Decimal value of the ASCII character %c = %d\n",input,ascii_decimal);
           // to find decimal value of entered hexadecimal value we need to recall that
           // '0' is mapped to 0,'1' is mapped to 1 and so on upto 9
           int hexa = input-'0'; //this will automaticallt shift all input to 0 to 9
           printf("Decimal value of the Hexadecimal digit %c = %d\n",input,hexa);
       }
       else
       {
           // to find decimal value of the ASCII character read, we need to understand that all character are
           // mapped to some integer valuse,
           // so if we typecast given input to integer, it will give us decimal of ascii character
           int ascii_decimal = (int) input;
           printf("Decimal value of the ASCII character %c = %d\n",input,ascii_decimal);
           // to find decimal value of entered hexadecimal value we need to recall that
           // 'A' is mapped to 10,'B' is mapped to 11 and so on upto 15
           int hexa = input-'A'+10; //this will automaticallt shift all input by 10
           printf("Decimal value of the Hexadecimal digit %c = %d\n",input,hexa);
       }
       /* here we are assuming that user will always entered allow value, otherwise you can try below code
       which is same as above but its handling invalid input

           if(input>='0'&&input<='9')
           {
               // to find decimal value of the ASCII character read, we need to understand that all character are
               // mapped to some integer valuse,
               // so if we typecast given input to integer, it will give us decimal of ascii character
               int ascii_decimal = (int) input;
               printf("Decimal value of the ASCII character %c = %d\n",input,ascii_decimal);
               // to find decimal value of entered hexadecimal value we need to recall that
               // '0' is mapped to 0,'1' is mapped to 1 and so on upto 9
               int hexa = input-'0'; //this will automaticallt shift all input to 0 to 9
               printf("Decimal value of the Hexadecimal digit %c = %d\n",input,hexa);
           }
           else if(input>='A'&&input<='F')
           {
               // to find decimal value of the ASCII character read, we need to understand that all character are
               // mapped to some integer valuse,
               // so if we typecast given input to integer, it will give us decimal of ascii character
               int ascii_decimal = (int) input;
               printf("Decimal value of the ASCII character %c = %d\n",input,ascii_decimal);
               // to find decimal value of entered hexadecimal value we need to recall that
               // 'A' is mapped to 10,'B' is mapped to 11 and so on upto 15
               int hexa = input-'A'+10; //this will automaticallt shift all input by 10
               printf("Decimal value of the Hexadecimal digit %c = %d\n",input,hexa);
           }
           else
           {
               printf("you have entered invalid input!!\n");
           }
       */
       fflush(stdin);
   }
   return 0;
}