如何定义和声明，尽管它被定义和声明?

how to define and declare although it is defined and declared?

本文关键字：声明 定义 何定义      更新时间：2023-10-16

我知道这个问题看起来很混乱，但说实话，它不像看起来那样。 我正在建立一个关于无人机的程序(对不起，如果它没有意义( 从这段代码中，我得到错误"(第 116 行(标识符"camrecord"未定义"和"编译器错误 C2065 "(第 116 行(标识符"：未声明的标识符"，尽管我已经识别并声明了它们？如何解决这个问题？ 谢谢

#include<iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>
#include <string.h>

using namespace std;

void manualMode();
void defaultMode();
void Getdata(double & camrecord, double & Projectframerate);
void calculate(double & camrecord, double & Projectframerate, double & actualframerate);



int speed, timeTofly, operation;
int angle = 90;

int main() {
int mode = 0, part = 3;
double flyLevel;
int obstacleSensor = 0, timer = 3, AccelerometerSensor = 0, tempSensor = 25;
char startPause;
cout << "Drone Flying Technology" << endl;
do {
cout << "Choose Mode: (1)Default, (2)Manual n";
cin >> mode;
if (mode == 1)
defaultMode();
if (mode == 2)
manualMode();
} while (mode == 0);

cout << "Choose how to fly: (1)Upper , (2)Lower , (3)Upper and Lower n";
cin >> part;
switch (part) {
case 1:
case 2:
flyLevel = 0.5;
break;
case 3:
flyLevel = 1;
break;
}
if (obstacleSensor == 0) {
do {
cout << "Press (S) to Start,and swing the propeller." << endl;
cin >> startPause;
cout << "LED is Onn";
while (AccelerometerSensor != flyLevel) {
AccelerometerSensor++;
}
cout << "Flying session Started! Time Left:" << timeTofly << endl;
cout << "Eagle eye Operation Started!n";
timeTofly = timeTofly / 2;
cout << "Crusing mode initiate Time Left:" << timeTofly << endl;
timeTofly = timeTofly / 2;
cout << "Free fly commenced Time Left:" << timeTofly << endl;
timeTofly = 0;
startPause = 'P';
} while ((startPause == 's') || (startPause == 'S'));
}
cout << "End!nLED is Off";
return 0;
}


void manualMode() {
cout << "Enter drone speed (knot) n";
cin >> speed;
cout << "Enter Time to fly: n";
cin >> timeTofly;
cout << "Choose Operation: (1)Fully manual, (2)Normal Orientation, (3)Free orientation, (4)FPV racing, (5)Alln";
cin >> operation;
}
void defaultMode() {
int howtofly;
cout << "how to fly: (1)Circle, (2)Altitude Hold, (3)Free orientation";
cin >> howtofly;
switch (howtofly) {
case 1:
speed = 30;
timeTofly = 3;
break;
case 2:
speed = 40;
timeTofly = 3;
break;
case 3:
speed = 60;
timeTofly = 3;
break;
}


char name[25];
char id[5];
float m1, m2, m3, m4, m5;

ofstream outputFile("droneinfo.txt", ios::out);

cout << "Please enter object you want to record,drone id imei number and your 5 preferred video fps:n";
cout << "nPress <ctrl> + z to stop. n";

while (cin >> id >> name >> m1 >> m2 >> m3 >> m4 >> m5)
{
outputFile << id << " " << name << " " << m1 << " " << m2 << " " << m3 << " " << m4 << " " << m5 << endl;
}

double fps = 0.0;
double Projectframerate = 0.0;

double actualframerate, out = 0;


Getdata(camrecord, Projectframerate);
calculate(camrecord, Projectframerate, actualframerate);
cout << "The actual frame rate is =" << actualframerate << " f/sn";


}
void Getdata(double& camrecord, double& Projectframerate) {
cin >> camrecord;
cin >> Projectframerate;

cout << "Please entern Recording frame rate =" << camrecord << "f/s ,ndesired frame rate="
<< Projectframerate << "f/sn";
}

//-------------------//
void calculate(double& camrecord, double& Projectframerate, double& actualframerate) {
actualframerate = camrecord / Projectframerate;
}

//-------------------//

因此，当您想要输入变量并对其进行修改时，将使用引用作为参数。查看void Getdata(double& camrecord, double& Projectframerate)，您是说Getdata采用摄像机记录和投影帧速率，读取这些值并对其进行修改，以便调用方可以使用新值。

查看代码，似乎并没有Getdata实际上是在读取输入值。所以存在不一致。

为了与方法的实现保持一致，方法Getdata不应接受任何参数 - 而只返回它们。现在，您不能返回两个参数，但可以将它们打包到一个结构中并返回：

struct Data
{
double camrecord;
double Projectframerate;
};
Data Getdata();

然后，Getdata的定义可以是：

Data getData()
{
Data data;
cin >> data.camrecord;
cin >> data.Projectframerate;

cout << "Please entern Recording frame rate =" << data.camrecord << "f/s ,ndesired frame rate="
<< data.Projectframerate << "f/sn";
return data;
}

同样可以为calculate.

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