Question

I’m almost done with this program, but something’s not right in main. Here are the project instructions:

Assignment:
Write a program which keeps track of the number of roaches in two adjacent houses for a number of weeks. The count of the roaches in the houses will be determined by the following:

1. The initial count of roaches for each house is a random number between 10 and 100.
2. Each week, the number of roaches increases by 30%.
3. The two houses share a wall, through which the roaches may migrate from one to the other. In a given week, if one house has more roaches than the other, roaches from the house with the higher population migrate to the house with the lower population. Specifically, 30% of the difference (rounded down) in population migrates.
4. Every four weeks, one of the houses is visited by an exterminator, resulting in a 90% reduction (rounded down) in the number of roaches in that house.

Here’s my code:

#include <iostream>
#include <cmath>
using namespace std;

int house, increase, roaches, filthyBeasts; // My variables for my four functions
int initialCount(int house);
int weeklyIncrease(int increase);
int roachesMigration(int more, int fewer, int change);
int exterminationTime (int filthyBeasts);
// My four function prototypes 

int main()
{
    int houseA, houseB;

    houseA = initialCount(houseA); //Initializing the inital count of House A.
    houseB = initialCount(houseB); //Initializing the inital count of House B.

    int week = 0;
    for (week = 0; week < 11; week++) // My for loop iterating up to 11 weeks.
    {
        houseA = weeklyIncrease(houseA);
        houseB = weeklyIncrease(houseB);

        cout << "For week " << week << ", the total number of roaches in House A is " << houseA << endl;
        cout << "For week " << week << ", the total number of roaches in House B is " << houseB << endl;

        if((houseA > houseB)) // Migration option 1
        {
            houseB = roachesMigration(houseA, houseB);
        }
        else if((houseB > houseA)) // Migration option 2
        {
            houseA = roachesMigration(houseA, houseB);
        }


        if ((week + 1) % 4 == 0) // It's extermination time!
        {
            if ((rand() % 2) == 0) // Get a random number between 0 and 1.
            {
                houseB = exterminationTime(houseB);
            }
            else
            {
                houseA = exterminationTime(houseA);                   
            }
        }
    }

    return 0;
}

int initialCount(int house) // Initializing both houses to random numbers between 10 and 100.
{
    int num;
    num = (rand() % 91) + 10;
    return num;
}

int weeklyIncrease(int increaseHouses) // Increasing the roaches in both houses by 30% weekly.
{
    int increase = 0;
    increase = (increaseHouses * .3) + increaseHouses;
    return increase;
}

int roachesMigration(int more, int fewer, int change)
{
    more -= change;
    fewer += change;   
    return ((more - fewer) * .3);
}


int exterminationTime(int filthyBeasts) // Getting rid of the filthy little beasts!
{
    filthyBeasts = (filthyBeasts * .1);
    return filthyBeasts;
}

There are issues with the migration and extermination functions. I’m receiving an error message from the compiler that says, “error: Semantic Issue: No matching function for call to ‘roachesMigration'”. Also, at weeks 4 and 8, the randomly selected house should get exterminated, and the number of roaches in that house should be 90% less than the previous week. What do you guys think I should do to correct this issues? I really appreciate all help!

Answer 1

Hint: I notice that you’re printing the value of week out at the end of your for loop. In other words, your output should be something like:

For week 0, the total number of roaches in House A is 4
For week 0, the total number of roaches in House B is 5
0
For week 1, the total number of roaches in House A is 6
For week 1, the total number of roaches in House B is 7
1

However, I suspect that the weeks being printed are not what they should be.