Trying to code a pump using an input from a moisture sensor

Using Arduino Programming Questions
2 
void setup() {
// here's where you setup the pin modes for your sensor, other inputs and outputs etc.
}

void loop() {
if (sensorValue() >= 400) wateringOff();
if (sensorValue() <= 200) wateringOn();
}

int sensorValue() {
int x = 0;
// where you read the pin value into x
return x;
}

void wateringOff() {
// where you do what you need to turn off the water
}

void wateringOn() {
// where you do what you need to turn on the water
)