Example

void function(int input)
{
if (input &  0x101){
doSomething();
}
}

Solution
If the result is not equal to zero, then the condition evaluates to true. It is more clear if you show this directly.

void 
function( int input)
{
int result = input & 0x101;
if (result != 0){
doSomething();
}
}