Set or Clear a Specific Bit in a Register

Code

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    if (mode == 1){
        reg |= (1 << pos);
    } else {
        reg &= ~(1 << pos);
    }
    return reg;
}

int main() {
    unsigned char reg;
    int pos, mode;
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}

Solving Approach

• Read inputs: reg, pos, mode
• Create mask: mask = 1 << pos
• If mode = 1 → reg |= mask
• If mode = 0 → reg &= ~mask
• Print updated reg