1. Set or Clear a Specific Bit in a Register

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



unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    
    uint8_t Reg = reg;
    int bitPos = pos;
    int bitMode = mode;
    
    switch(mode){
        case 0:
            Reg &= ~(1 << bitPos);
            break;
        case 1:
            Reg |= (1  << bitPos);
        break;
    }


    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;
}