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
    reg = (reg & ~(1<<pos)) | (mode<<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;
}

Solving Approach

• Better Approach
  
  we have given a register, a bit position to to set/clear according to mode.
  Step - 1: Make the bit position 0
• reg = (reg & ~(1<<pos)) 
  Step - 2: Now push the bit according to mode (0 if mode=0; else 1)
   
• reg |= (mode<<pos)