C - How to concatenate any combination char or int in array to binary string of type int or char

Question

Brand new to the board. I really try to solve my programming conundrums without bogging down a public forum, and stackoverflow has helped with many a problem, but I'm at a loss. I hope you can help.

I am attempting to concatenate/combine, single digit characters in an array into a variable that takes the form of a binary string of format 10101010. There is no arithmetic involved and all characters are single-digit 1s and 0s. I have scoured the Web for a solution and I have tried everything from strcat(), otoi(), sprintf(), etc. I have even tried using a String array[] to construct my variable and then convert type using strtoul(). The code below reflects my latest attempt, which compiles successfully, but appears to produce blank characters. Understanding that I may be way off track with this solution, I am open to any solution that works.

The code:

#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <stdlib.h>

char digit[48] = "";

char buf[9];
snprintf(buf, sizeof buf, "%s%c", digit[16], digit[17], digit[18], digit[19], digit[20],_ 
digit[21], digit[22], digit[23]);

As you can see, the idea is to be able to take any digits from char digit[48] and combine them into the desired format. Truthfully, I'm not interested in adding the characters into a new array, but I got to the point of trying anything. My preference is to have the result accessible via a single variable to then use for bitwise operations and direct input into integrated components. Than you for any assistance you can provide.

Community · Accepted Answer · 2017-05-23 10:26:59Z

1

Take a look at Converting an int into a base 2 cstring/string

and note (if you're using Linux) that I believe the deprecated function name there is _itoa.

edited May 23, 2017 at 10:26

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answered Apr 11, 2015 at 3:50

koan911

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12 Comments

K D Over a year ago

I reviewed the suggested link. Thank you. However, what I am trying to do is not exactly converting an integer to a binary string. The number 1 is represented as 00000001 in binary. In my implementation that is of little use to me. I quite literally want to combine the 1s and 0s in a char array into a char or int variable that takes the form of a binary string. For example: int num = 10101010 using the characters in the array. I apologize if I was not clear on that.

koan911 Over a year ago

int atob(char *binary)

koan911 Over a year ago

Very sorry for my careless misinterpretation!! <verbatim> /* This gives the general idea, bit but not ruggedized with error checking, (illegal characters and overflow). */ #include <iostream> #include <stdint.h> using namespace std; uint64_t decode_binary(char *binary) { uint64_t num = 0; for (char *cp = binary; *cp; cp++) { num <<= 1; if (*cp == '1') num |= 1; } return num; } int main (int argc, char *argv[]) { uint64_t num = decode_binary("110011"); cout << "num: " << num << endl; } </verbatim>

koan911 Over a year ago

Very sorry for my careless misinterpretation!! <verbatim> /* This gives the general idea, bit but not ruggedized with error checking, (illegal characters and overflow). */ #include <iostream> #include <stdint.h> using namespace std; uint64_t decode_binary(char *binary) { uint64_t num = 0; for (char *cp = binary; *cp; cp++) { num <<= 1; if (*cp == '1') num |= 1; } return num; } int main (int argc, char *argv[]) { uint64_t num = decode_binary("110011"); cout << "num: " << num << endl; }

K D Over a year ago

koan, is this solution for C++? I checked out iostream and the information I'm seeing indicates this is specific to C++. I am using C and while I have read that they are similar, that similarity is not intuitive to me.

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