How to convert decimal number to binary number using JavaScript

The following functions can convert decimal numbers to binary numbers:

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#include

#include

#define MAX 33

usingnamespacestd;

/* Convert decimal number to binary number (string representation) */

char*decToBin(longnum);

intmain()

{

longdec = 123456789;

cout

cout

return0;

}

/* Convert decimal number to binary number (string representation) */

char*decToBin(longnum)

{

char*arr;

chartemp;

inti, n;

arr = (char*)malloc(sizeof(char) * MAX);

n = 0;

while(num > 0)

{

arr[n ] = num % 2 '0';

num /= 2;

}

for(i=0; i

{

temp = arr[i];

arr[i] = arr[n-1-i];

arr[n-1-i] = temp;

}

arr[n] = '\0';

returnarr;

}

1. Decimal number refers to a value in which all digits are composed of numbers less than 10 (0..9), such as 123, 45678, etc. A binary number refers to a numerical value in which all digits are composed of digits less than 2 (0..1), such as 10, 1011, etc. Converting a decimal number to a binary number is to convert a value composed entirely of digits less than 10 into a value composed entirely of digits less than 2. For example, the decimal number 100 is converted into a binary number 1100100.

2. The algorithm for converting decimal numbers into binary numbers is to use the Euclidean remainder method, that is, the number to be converted is divided by 2 to take the remainder, record the remainder, and use the new quotient to continue dividing by 2 to take the remainder until the number is zero. Since the remainder is less than 2, all values ​​composed of remainders are composed of 0 and 1. Then just reverse these remainders.

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