Validate Configuration Register Layout

Code

#include <stdio.h>

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer 
    if(cfg->reg&0x1)
    {
        if((cfg->reg >> 2) < 3)
        {
            if((cfg->reg >> 4)==0)
            {
                return 1;
            }
        }
    }
    return 0;
}

int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

    int result = validate_config(&cfg);
    printf("%d", result);

    return 0;
}

Solving Approach

• Return 1 if:
  • Bit 0 is set (Enable ON)
  • Bits 2–3 contain a valid priority (not 11)
  • All bits 4–15 are 0
• Return 0 otherwise