Thread: Function purpose

Hi ,
Could you please help me understand what the "test" function do ?
test(15,8) >> gives 16
test(7,15) >> gives 17

thanks

Code:

#include <stdio.h>

int test(unsigned int n ,unsigned int m);

int main()
{

unsigned int k;

k=test(15,8);
printf("k= %d\n",k);  // k=16

return 0;
}

int test(unsigned int n ,unsigned int m)
{
return (n+m -1)& ~ (m-1);
}