[英]How do I pass a return value to another function and assign the return value to a variable within that function?
我的程序由 3 個文件組成。 clockType.h - class function 原型,clockTypeImp.cpp - 函數定義,以及測試程序 testClockClass.cpp。
我試圖在下面的代碼中將第一個 function 的返回值傳遞給下一個 function。 我想我應該將它作為參考周界或指針*傳遞。
您可以看到我將返回值分配給變量diffSec
的失敗嘗試。
(我想要做的是將兩個時鍾之間的秒差轉換為HH:MM:SS
)。
我的clockTypeImp.cpp 實現文件的一部分:
int clockType::clockDiffseconds(clockType otherClock) {
int elapsedSec;
return (abs(elapsedTimeSeconds() - otherClock.elapsedTimeSeconds()));
}
void clockType::secondsToHHMMSS() {
int diffSec = clockType::clockDiffseconds(clockType otherClock);
int diffHours = diffSec/3600;
int diffMinutes = (diffSec/60)%60;
int diffSeconds = diffSec%60;
cout << "Converted to HH:MM:SS: " << diffHours << ":" << diffMinutes << ":" << diffSeconds;
}
我的clockType.h文件的一部分,clockType來自:
class clockType {
public:
void remainingTimeSeconds(int& totalEndSec); // Function to convert clock to time remaining in seconds.
int clockDiffseconds(clockType otherClock); // Function for finding difference in time between clocks.
void secondsToHHMMSS(); // Function for converting seconds to HH:MM:SS.
bool equalTime(const clockType& otherClock) const; // Function to compair the two times.
private:
int hr; // Variable to store the hours.
int min; // Variable to store the minutes.
int sec; // Variable to store the seconds.
};
這是我的測試程序的一部分。
#include <iostream>
#include <iomanip>
#include "clockType.h"
using namespace std;
int main() {
clockType myClock;
clockType yourClock;
int hours;
int minutes;
int seconds;
int elapsedSec;
int totalEndSec;
cout << endl << "myClock Time is not set:\n";
myClock.printTime();
cout << endl << "myClock Time is set:\n";
myClock.setTime(9, 3, 30);
myClock.printTime();
cout << endl;
cout << endl << "yourClock Time is not set:\n";
yourClock.printTime();
cout << endl << "yourClock Time is set:\n";
yourClock.setTime(5, 45, 16);
yourClock.printTime();
cout << endl << endl;
if (myClock.equalTime(yourClock)) {
cout << "Both times are equal." << endl;
} else {
cout << "The two times are not equal." << endl;
}
cout << endl << "Set the time for myClock\nEnter the hours, minutes, and seconds:\n";
yourClock.remainingTimeSeconds(totalEndSec);
cout << "\x1B[32m-->\033[0m" << " The total remaining seconds of \x1B[32myourClock\033[0m is: " << totalEndSec << endl;
myClock.remainingTimeSeconds(totalEndSec);
cout << "\x1B[33m-->\033[0m" << " The total remaining seconds of \x1B[33mmyClock\033[0m is: " << totalEndSec << endl;
cout << endl;
cout << "\x1B[34m-->\033[0m" << " The difference in seconds between the \x1B[34mtwo clocks\033[0m is: " << myClock.clockDiffseconds(yourClock) << endl;
如果您需要查看文件的完整代碼,請告訴我。
clockDiffseconds()
是一種非static
方法,它作用this
,計算this
時鍾與另一個時鍾otherClock
之間的秒差。 那也行。
但是secondsToHHMMSS()
沒有otherClock
的概念。 它也是一個僅作用this
的非static
方法。 因此, secondsToHHMMSS()
有意義,您有幾個選擇:
重新思考secondsToHHMMSS()
對您的實際意義。 按照您編寫的方式,它應該按原樣打印this
秒數。 在這種情況下,使用clockDiffseconds()
返回的值構造一個新的clockType
object,其elapsedTimeSeconds()
僅返回該值,然后在該新clockType
object 上調用secondsToHHMMSS()
,例如:
class clockType { public:... clockType clockDiff(clockType otherClock) const; void secondsToHHMMSS() const;... };
clockType clockType::clockDiff(clockType otherClock) const { int elaspedSec = abs(elapsedTimeSeconds() - otherClock.elapsedTimeSeconds()); return clockType(elaspedSec); // add a constructor to clockType that stores elaspedSec in such // a way that its elapsedTimeSeconds() can then return it... } void clockType::secondsToHHMMSS() const { int elapsedSec = elapsedTimeSeconds(); int hours = elapsedSec/3600; int minutes = (elapsedSec/60)%60; int seconds = elapsedSec%60; cout << "Converted to HH:MM:SS: " << hours << ":" << minutes << ":" << seconds; }
clockType myClock, yourClock, elapsed;... elapsed = myClock.clockDiff(yourClock); elapsed.secondsToHHMMSS();...
否則,如果您真的希望secondsToHHMMSS()
以秒為單位表示兩個時鍾之間的差異,那么您必須將otherClock
作為參數傳遞給secondsToHHMMSS()
,就像您已經對clockDiffseconds()
所做的那樣,例如:
class clockType { public:... int clockDiffseconds(clockType otherClock) const; void secondsToHHMMSS(clockType otherClock) const;... };
int clockType::clockDiffseconds(clockType otherClock) const { return abs(elapsedTimeSeconds() - otherClock.elapsedTimeSeconds()); } void clockType::secondsToHHMMSS(clockType otherClock) const { int diffSec = clockDiffseconds(otherClock); int diffHours = diffSec/3600; int diffMinutes = (diffSec/60)%60; int diffSeconds = diffSec%60; cout << "Converted to HH:MM:SS: " << diffHours << ":" << diffMinutes << ":" << diffSeconds; }
clockType myClock, yourClock;... myClock.secondsToHHMMSS(yourClock);...
否則,請考慮將secondsToHHMMSS()
更改為static
方法,然后將所需的秒數作為參數傳遞,例如從早期調用clockDiffseconds()
,例如:
class clockType { public:... static void secondsToHHMMSS(int seconds);... };
void clockType::secondsToHHMMSS(int seconds) const { int hours = seconds/3600; int minutes = (seconds/60)%60; seconds = seconds%60; cout << "Converted to HH:MM:SS: " << hours << ":" << minutes << ":" << seconds; }
clockType myClock, yourClock;... int diffSec = myClock.clockDiffseconds(yourClock); clockType::secondsToHHMMSS(diffSec);...
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