Question

How to parse and int bits into an array in C

Answer 1

#include <stdio.h>

#define SIZE 16

void int_to_binary_array(unsigned int n, int total, int* bits) {
    unsigned int mask = 1U << (total - 1); // 32768
    
    for (int i = 0; i < total; i++) {
        bits[i] = (n & mask) ? 1 : 0;
        n <<= 1;
    }
}

int main()
{
    int bits[SIZE] = { 0 };

    int_to_binary_array(511, SIZE, bits);

    for (int i = 0; i < SIZE; i++) {
        printf("%d ", bits[i]);
    }

    return 0;
}



/*
run:

0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1

*/

 

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