Integer to Binary Conversion [C/C++]

// C/C++

// [VC] suppress error messages about obsolete & deprecated functions

#pragma warning(disable : 4996)

#define _CRT_SECURE_NO_WARNINGS

#define _CRT_SECURE_NO_WARNINGS_GLOBALS

#include <cstdio>

#include <cstdlib>

#define LENGTH 11

int main(int argc, char **argv)

{

char buffer[LENGTH];

int number = 0;

do {

fgets(buffer, LENGTH, stdin);

number = atoi(buffer);

} while (number < 0);

printf("%12s %d\n", "Integer", number);

printf("%12s %X\n", "Hexadecimal", number);

printf("%12s ", "Binary");

unsigned int mask = 0;

// this grotesque hack creates a bit pattern 1000...

// regardless of the size of an unsigned int

mask = ~mask ^ (~mask >> 1);

// print out all bits of n

while (mask != 0)

{

// !!x is 0 if x is 0 and 1 if x is anything else

printf("%d", !!(number & mask));

mask = mask >> 1;

}

putchar('\n');

return EXIT_SUCCESS;

}

// C/C++

// [VC] suppress error messages about obsolete & deprecated functions

#pragma warning(disable : 4996)

#define _CRT_SECURE_NO_WARNINGS

#define _CRT_SECURE_NO_WARNINGS_GLOBALS

#include <iostream>

#include <string>

#define LENGTH 11

using namespace std;

int main(int argc, char **argv)

{

char buffer[LENGTH];

int number = 0;

do {

fgets(buffer, LENGTH, stdin);

number = atoi(buffer);

} while (number < 0);

printf("%12s %d\n", "Integer", number);

printf("%12s %X\n", "Hexadecimal", number);

string binary = "";

int remainder = 0;

do {

remainder = number % 2;

itoa(remainder, buffer, 10); // here 10 means decimal

binary.insert(0, buffer);

number = number / 2;

} while (number != 0);

printf("%12s %s\n", "Binary", binary.c_str());

return EXIT_SUCCESS;

}