1. Set or Clear a Specific Bit in a Register

#include <stdio.h>
// #include <math.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // int set = 255, clear = 0;
    // int num = pow(2,pos);
    // if(mode){
    //     return reg | num;
    // }
    // else {
    //     return reg & (255-num);
    // }

    reg = mode? (reg|= (1<<pos)): (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;
}