1. Set or Clear a Specific Bit in a Register

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    if (pos < 0 || pos > 7 || (mode != 0 && mode != 1)) {
        printf("Invalid input\n");
        return reg;  // return unchanged
    }
     
       if( mode == 1 ){
       reg |=(1 << pos);
       }
       else if(mode == 0) {
        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;
}