Set or Clear a Specific Bit in a Register

Code

#include <stdio.h>

unsigned char modifyBit(unsigned char reg, int pos, int mode) {
    // Write your code here
    if (mode == 1) {
        //Set the bit for the position pos
        reg |= (1 << pos);
    } else if (mode == 0)  {
        //Clear the bit at the position pose
        reg &= ~(1 << pos);
    }
    return reg;

}

int main() {
    unsigned char reg; // This is your 8-bit register
    int pos, mode;
    scanf("%hhu %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}

Solving Approach

Use If else and below shorthand for bit manipulation

reg |= (1 << n);     // Set bit n
reg &= ~(1 << n);    // Clear bit n
reg ^= (1 << n);     // Toggle bit n
if (reg & (1 << n))  // Check if bit n is set