Exchange odd and even digits of an integer

Problem definition:

Write a program to swap odd and even bits in an integer with as few instructions as possible (E. g, bit 0 and bit 1 are swapped, bit 2 and bit 3 are swapped, etc)

The Code is as follows. I thought about it for one night and thought it was too bad.

# Include <stdio. h> int swapoddevenbit (int x) {return (X & 0 xaaaaaaaa)> 1) | (X & 0x55555555) <1 ));} int main (INT argc, char * argv []) {int A = 171; printf ("% d \ n", swapoddevenbit (a); Return 0 ;}

171: 10101011

01010111: