我試圖開發一個同時顯示 12 小時和 24 小時時鐘的程式。但是每當我編譯時，我都會收到一個構建錯誤，說“GetAM_PM”：找不到識別符號。盡管在我的函式引數中使用了相同的變數，但我在第 26 行得到了這個錯誤。這個問題的根源可能是什么？這是我的代碼：
#include <iostream>
#include<ctime>
#include<cstdlib>
using namespace std;
//converting it into 12 hour format
int TwelveHourFormat(int twelve_hours) {
return (twelve_hours == 0 || twelve_hours == 12) ? 12 :
twelve_hours % 12;
}
//printing the 12 hour format
void Display_12_HourFormat(int seconds, int minutes, int
twelve_hours) {
cout.fill('0');
cout << TwelveHourFormat(twelve_hours) << ":" << minutes << ":"
<< seconds << " " << GetAM_PM(twelve_hours);
}
//printing the 24 hour format
void Display_24_HourFormat(int seconds, int minutes, int
twenty_four_hours) {
cout.fill('0');
cout << twenty_four_hours << ":" << minutes << ":" << seconds;
}
void AddHour(int hour) {
hour = (hour 1) % 24;
}
void AddMinute(int hour, int min) {
if (min == 59) {
AddHour(hour);
}
min = (min 1) % 60;
}
void AddSecond(int min, int sec) {
if (sec == 59) {
AddMinute(min, sec);
}
sec = (sec 1) % 60;
}
// function return AM/PM respect to hour of time
string GetAM_PM(int twelve_hours) {
return twelve_hours >= 12 ? "PM" : "AM";
}
// This method prints the menu options
void DisplayMenu() {
cout << "Chada Tech Clocks Menu" << endl;
cout << "[1] Add one hour" << endl;
cout << "[2] Add one minute" << endl;
cout << "[3] Add one second" << endl;
cout << "[4] Exit program" << endl;
}
int main()
{
int seconds, minutes, hours;
//obtains current time in seconds
time_t total_seconds = time(0);
//getting values of seconds, minutes and hours
struct tm ct;
localtime_s(&ct, &total_seconds);
seconds = ct.tm_sec;
minutes = ct.tm_min;
hours = ct.tm_hour;
// Variable declared
int option;
do
{
// DisplayMenu function is called
DisplayMenu();
cin >> option;
// If user input is 1, Clock function is called
if (option == 1) {
TwelveHourFormat(hours);
AddHour(hours);
GetAM_PM(hours);
Display_12_HourFormat(seconds, minutes, hours);
Display_24_HourFormat(seconds, minutes, hours);
}
// If the option is 2, the Clock function is called
else if (option == 2) {
AddMinute(minutes, seconds);
GetAM_PM(hours);
}
// If the option is 3, the Clock function is called
else if (option == 3) {
AddSecond(minutes, seconds);
GetAM_PM(hours);
}
// If the option is 4, exit message prints and application
stops running
else if (option == 4) {
cout << "You have exited the application.";
break;
}
else {
cout << "You have entered an invalid input." << endl;
}
} while (option != 4);
}
uj5u.com熱心網友回復：
您需要GetAM_PM在定義之前宣告Display_12_HourFormat。Display_12_HourFormat否則編譯器在決議被呼叫的函式時不會知道它GetAM_PM。
uj5u.com熱心網友回復：
只需將這些行移到開頭，在任何其他功能之前：
// function return AM/PM respect to hour of time
string GetAM_PM(int twelve_hours) {
return twelve_hours >= 12 ? "PM" : "AM";
}
不是這種情況，但如果最終出現回圈依賴，請嘗試在 .h 中宣告方法或在代碼中前向宣告方法。
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