Thread: Multiply it by 10 then Int to Hex

Write a C program that prompts the user to enter a hex value, muliplies it by ten, then displays the result in hex.

I already made a fuction hexToInt and intToHex, but I am still puzzled and how to mulitply it by 10. After I read in the string then I think I should convert the hex to int then mulitply it by 10 the convert the int back to hex.

I can't do a n*=10 ??

Code:

#include <stdio.h>
#include "readIn.h"
#include "hexToInt.h"
#include "intToHex.h"
#define BUFFER_SIZE 9
int main()
{
unsigned char *n;
unsigned int temp;
n=malloc(BUFFER_SIZE);

printf("Enter a Hexadecimal >> ");
fflush(stdout);

readIn(n, BUFFER_SIZE);

printf("%d\n",hexToInt(n));
/*i can't do n*=10 */
printf("%x\n",intToHex(n));
fflush(stdout);
return 0;
}

Ok first off there is a c standard function that converts hex strings to an integer, strtol(). Secondly, whats the problem? Hex is just a way you and I read a number. To the computer hexadecimal, decimal, binary, octal, etc. are all the same. Your code could simply be this:

Code:

#include <stdio.h>
#include <stdlib.h>

#define BUFFER_SIZE 9
int main()
{
  unsigned char *n;
  unsigned int temp;

  if((n=malloc(BUFFER_SIZE))) {
    printf("Enter a Hexadecimal >> ");
    scanf("%x", &temp);

    printf("%x", temp*10);
    return 0;
}

Originally Posted by master5001

Ok first off there is a c standard function that converts hex strings to an integer, strtol(). Secondly, whats the problem? Hex is just a way you and I read a number. To the computer hexadecimal, decimal, binary, octal, etc. are all the same. Your code could simply be this:

Code:

#include <stdio.h>
#include <stdlib.h>

#define BUFFER_SIZE 9
int main()
{
  unsigned char *n;
  unsigned int temp;

  if((n=malloc(BUFFER_SIZE))) {
    printf("Enter a Hexadecimal >> ");
    scanf("%x", &temp);

    printf("%x", temp*10);
    return 0;
}

Acutally it can't I have to create a function that turns a hex to int and int to hex. Here is the project.
http://www.cs.sonoma.edu/~stauffer/2....Project1.html

I have everything done, now i just need to muplitply it by 10.

Silly me. Anyways, yeah what Salem said!!!

Here is where I am confused. Why can't you have a line that says n *= 10;

If anything why not just do this:

Code:

printf("%x\n",intToHex(n*10));

wait...what is the prototype for intToHex()? Shouldn't it be returning a string? Again hex is an abstract concept that you and I use. To the computer 10 is 10 whether you write it as 1010 or 0x0A or 012. If intToHex() is returning an int, then I think you are not understanding this concept.

Unless of course your code is:

Code:

int intToHex(int i) {
  return i;
}

lmao! I was going to say that and thought it may come across as too sarcastic. I honestly don't think he is stating his actual problem. No where in his assignment did it say he was not allowed to do n *= 10 or someFunction(n*10). He has just said he can't do it...like he is physically unable to type it.

I did read your code, but i need to use the functinos that I have. This is my first time programing with C, please give me a break =/

Originally Posted by quzah

Is it your first time thinking too? I swear to god everyone is stupid here today.

Quzah.

I been only programing for only 2 weeks, gives us a break you ass.