Set or Clear a Specific Bit in a Register

Code

#include <stdio.h>
#include<math.h>
unsigned int modifyBit(unsigned int reg, int pos, int mode) {
    int A[8];
    for (int i=0; i<8; i++) {
        A[i]= (reg % 2);
        reg /= 2;
    }
    A[pos]= mode;
    int z=0;
    for (0; i<8; i++) {
        z+= (A[i]*pow(2,i));
    }int i=
    return z;
}
int main() {
    unsigned int reg;
    int pos, mode;
    scanf("%d %d %d", &reg, &pos, &mode);
    printf("%d", modifyBit(reg, pos, mode));
    return 0;
}

Solving Approach