Thread: Binary to string

Hello everyone,

I am having a bit of trouble. I am trying to read a string and convert it to binary. I finished the code, and it works, but I can't figure out how to convert binary back to string.

Here is what I have so far:

Code:

#include <stdlib.h>
#include <string.h>

int power(int, int);
char* stob(char *);	// string to binary

int main() {
	char str[1024];

	printf("Enter some text: ");
	scanf("%s", str);

	printf("Binary value: %s\n", stob(str));

	return 0;
}

int power(int base, int exponent) {
	int p;

	for (p = 1; exponent > 0; --exponent) 
		p = p * base;

	return p;
}

char* stob(char *str) {
	int i, j, len;
	static char temp[8192];
	char *buffer = &temp[0];

	buffer[0] = '\0';
	len = (strlen(str) > 1024) ? 1024 : strlen(str);

	for (i = 0; i < len; i++) {
		for (j = 7; j >= 0; j--) {
			if (str[i] >= power(2, j)) {
				strcat(buffer, "1");
				str[i] -= power(2, j);
			}else {
				strcat(buffer, "0");
			}
		}
		strcat(buffer, " ");
	}

	return buffer;
}

I just don't know how I'd write to convert that binary value back to a string. I have some ideas, but they don't seem to be right. Can anyone assist me in this?

Also, sry I didn't feel like using pow() from math.h so I wrote my own, doh.


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