cell.c

#include <stdio.h>
#include <math.h>  // for rounding

int main() {
    int population;

    // Input validation for initial population
    do {
        printf("What is the initial population? ");
        scanf("%d", &population);
        if (population < 100 || population > 500) {
            printf("The initial population given is incorrect\n");
        }
    } while (population < 100 || population > 500);

    int initial_population = population;
    double total_population = 0;
    int days = 0;

    // First part: 50 days cycle of feeding and splitting
    for (int i = 1; i <= 50; i++) {
        if (i % 3 == 0) {
            // Split population every third day
            population = (int) round(population * 0.5);
        } else {
            // Feed population, increasing by 66%
            population = (int) round(population * 1.66);
        }
        total_population += population;
        days++;
    }

    printf("The population after 50 days is %d\n", population);

    // Second part: population decreases by 16% until it falls below 100
    while (population >= 100) {
        population = (int) round(population * 0.84);
        total_population += population;
        days++;
    }

    printf("After %d days the population will return below 100\n", days);

    // Calculate average population
    double average_population = total_population / days;
    printf("On average there were %.2f cells in the colony\n", average_population);

    return 0;
}