Question

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Is there a printf converter to print in binary format?

Consider this small C application

int main () {
    int bits = 100 >> 3;    
    printf("bits => %d", bits);     
    return 0;
}

How can I print the bits variable so I can see it as a binary value (with the bits clearly shifted), e.g. 00001100?

I’m also learning, so feel free to correct any terminology.

Answer 1

This should work (not tested):

#define PRINT_BITS 7

void printbits(int input){
    int i, mask;

    for(i=PRINT_BITS; i >= 0; i--){
       mask = 1 << i;
       if(input & mask){
          printf("1");
       }else{
          printf("0");
       }
    }
 }