1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    unsigned char res;
    // if(mode == 1){
    //     //set
    //     res = reg || (1<<pos);
    // }
    // else{
    //     //clear
    //     res = reg & (~(1<<pos));
    // }
    res = (mode == 1)?(res = reg | (1<<pos)): (res = reg & (~(1<<pos)));
    return res;
}

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