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2-1-19.c

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#include<stdio.h>

#include<stdlib.h>

//

// Gray Code

//

int b2g(int n){

return n^(n>>1);

}

void grayCode(int n){

if(n==0) return;

int i;

int s = 1<<n;

for(i=0;i<s;i++)

printf("%d\n",b2g(i));

}

int main(){

grayCode(3);

return 0;

}