Question

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C printing bits

Lets say I have a uint16_t number something like:

uint16_t myVar = 0x3A44;

and I want to print the binary value if 0x3A44 from the myVar, how could I iteratively access and print each bit?

Treat it as a bit array?

Answer 1

Integers effectively are bit arrays. You can just loop through the value of the number, shifting the value to the right 16 times.

#include <stdio.h>
#include <stdint.h>

int main() {
    uint16_t x = 0xFF00;
    for (int i = 0; i < 16; i++) {
        printf("%d", (x & 0x8000) >> 15);
        x <<= 1;
    }
    printf("\n");
}

Results in:

1111111100000000