Bit Operations using Macros

Code

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

#define SET(reg,pos)   ((reg) |  (1U << (pos)))
#define CLR(reg,pos)   ((reg) & ~(1U << (pos)))
#define TGL(reg,pos)   ((reg) ^  (1U << (pos)))
#define CHK(reg,pos)   (((reg) >> (pos)) & 1U)

// Define bitwise macros here

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    reg = SET(reg, 2);   // set bit 2
    reg = SET(reg, 7);   // set bit 7
    reg = CLR(reg, 3);   // clear bit 3
    reg = TGL(reg, 5);   // toggle bit 5

    return reg;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", modify_register(reg));
    return 0;
}

Solving Approach