i think it will work...
#include<stdio.h>
unsigned getNextBigger(unsigned a) {
/* works for any word length */
unsigned c = (a & -a);
unsigned r = a+c;
return ((((r ^ a) >> 2) / c) | r);}
int getNextSmaller(int num) {
return ~getNextBigger(~num);}
int main(){
unsigned int res , min;
res = getNextBigger(12);
printf("max = %d" , res);
min = getNextSmaller(12);
printf("min = %d" , min);
return 0;}
Regards
Shivam
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