帮我用C语言写一段代码，要求如下：1.可以实现超声波的发送接收。2.可以实现得到超声波采集到的距离值。3.为提高超声波的测量精度，可以测量3此并取均值输出

以下是一段C语言代码，可以实现超声波的发送接收，并得到超声波采集到的距离值，同时为提高超声波的测量精度，可以测量3次并取均值输出。

#include <stdio.h>
#include <stdlib.h>
#include <wiringPi.h>

#define TRIG_PIN 4
#define ECHO_PIN 5

int main(void) {
    if (wiringPiSetup() == -1) {
        printf("wiringPi setup failed!\n");
        return 1;
    }

    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);

    while (1) {
        digitalWrite(TRIG_PIN, LOW);
        delayMicroseconds(2);
        digitalWrite(TRIG_PIN, HIGH);
        delayMicroseconds(10);
        digitalWrite(TRIG_PIN, LOW);

        while (digitalRead(ECHO_PIN) == LOW);

        long startTime = micros();
        while (digitalRead(ECHO_PIN) == HIGH);
        long travelTime = micros() - startTime;

        int distance = travelTime / 58;

        // measure 3 times and take average
        int totalDistance = distance;
        for (int i = 0; i < 2; i++) {
            delay(50);
            digitalWrite(TRIG_PIN, LOW);
            delayMicroseconds(2);
            digitalWrite(TRIG_PIN, HIGH);
            delayMicroseconds(10);
            digitalWrite(TRIG_PIN, LOW);

            while (digitalRead(ECHO_PIN) == LOW);

            startTime = micros();
            while (digitalRead(ECHO_PIN) == HIGH);
            travelTime = micros() - startTime;

            distance = travelTime / 58;
            totalDistance += distance;
        }
        distance = totalDistance / 3;

        printf("Distance: %d cm\n", distance);
        delay(500);
    }

    return 0;
}