growingPlant.cpp

// Caring for a plant can be hard work, but since you tend to it regularly, you have a plant that grows consistently. 
// Each day, its height increases by a fixed amount represented by the integer upSpeed. But due to lack of sunlight, 
// the plant decreases in height every night, by an amount represented by downSpeed.

// Since you grew the plant from a seed, it started at height 0 initially. Given an integer desiredHeight, 
// your task is to find how many days it'll take for the plant to reach this height.

// Example

// For upSpeed = 100, downSpeed = 10, and desiredHeight = 910, the output should be
// growingPlant(upSpeed, downSpeed, desiredHeight) = 10.

int growingPlant(int upSpeed, int downSpeed, int desiredHeight) {
    unsigned int speed = 0;
    for(unsigned int i = 0; speed < desiredHeight; i++)
    {
        speed += upSpeed;
        if(speed >= desiredHeight)
            return i + 1;
        speed -= downSpeed;
    }
    return 0;
}