"C" to write a function to place a number in the specified position 0 or 1

Write a function to place a number at a specified position of 0 or 1#include <stdio.h>unsigned int set_bit (unsigned int num, int pos, int flag) {int n = 1;n = n < ;< (pos-1);    The POS position of n is 1, the other is all 0if (flag = = 0) {num = num& (~n);} else if (flag = = 1) {num = num | n;} elseprintf ("Flag error\n"); return num;} int main () {printf ("%d\n", Set_bit (3,1,0));     2printf ("%d\n", Set_bit (4, 2, 1));   6printf ("%d\n", Set_bit (5, 1));  31return 0;} 

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"C" to write a function to place a number in the specified position 0 or 1