Decode Status Register into Human-Readable Flags

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

void decode_status(uint8_t reg) {
    char *arr[] = {
        "Power On",     // Index 0
        "Error",        // Index 1
        "Tx Ready",     // Index 2
        "Rx Ready",     // Index 3
        "Overheat",     // Index 4
        "Undervoltage", // Index 5
        "Timeout",      // Index 6
        "Reserved"      // Index 7
    };

    int is_first = 1; // Set our flag to "true" (1)

    for(uint8_t i = 0; i < 8; i++) {
        if(reg & 1U) {
            
            // If it is NOT the first item, print a newline to separate it
            // from the previous item.
            if (!is_first) {
                printf("\n");
            }
            
            // Print the string completely clean (no spaces, no \n)
            printf("%s", arr[i]); 
            
            // Turn the flag off. Every subsequent item will now print a \n first.
            is_first = 0; 
        }
        reg = reg >> 1;
    }
}

int main() {
    uint8_t reg;
    if (scanf("%hhu", &reg) == 1) {
        decode_status(reg);
    }
    return 0;
}

Solving Approach