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 = reg | (1 << pos);
    } else if (mode == 0) {   
        reg &= ~(1 << pos);
    }
    return reg;
    return 0;
}

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

• (1 << pos) → creates mask
• |= → sets that bit
• &= ~() → clears that bit
• mode (1 or 0) decides which operation to do