I need a C++ function that returns true or false depending on a probability func

Question

I need a C++ function that returns true or false depending on a probability function. This is a function to calculate the probability of a raider attack in Oregon Trail, based on the amount of miles travelled thus far.

Code:

bool Game::raiderChance()
{
double probability = ((((pow(((miles_gone/100) - 4), 2)) + 72) / ((pow(((miles_gone/100) - 4), 2)) + 12)) - 1) / 10;
  
if (current_milestone == 0)
{
return false;
}
  
return // true or false (was I attacked by raiders?)
}

Edit: For some reason people are confued on the threshold value? This is a formula out of 10 (if you just read it?) with a decimal value in the numerator. After the formula is calulated, it will be some percentage chance.

Explanation / Answer

raiderChance(current_milestone,miles_gone){
double probability = ((((pow(((miles_gone/100) - 4), 2)) + 72) / ((pow(((miles_gone/100) - 4), 2)) + 12)) - 1) / 10;
if (current_milestone == 0){
return false;
}
boolean flag = (probability >= 0.5) ? true : false ;
return flag;
}

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