# C++ 程序：計算兩個時間段之間的差異 > 原文： [https://www.programiz.com/cpp-programming/examples/time-structure](https://www.programiz.com/cpp-programming/examples/time-structure) 要理解此示例，您應該了解以下 [C++ 編程](/cpp-programming "C++ tutorial")主題： * [C++ 結構](/cpp-programming/structure) * [C++ 結構和函數](/cpp-programming/structure-function) * [C++ 指向結構的指針](/cpp-programming/structure-pointer) * * * * * * ## 示例：程序與時間差異 ```cpp // Computes time difference of two time period // Time periods are entered by the user #include <iostream> using namespace std; struct TIME { int seconds; int minutes; int hours; }; void computeTimeDifference(struct TIME, struct TIME, struct TIME *); int main() { struct TIME t1, t2, difference; cout << "Enter start time." << endl; cout << "Enter hours, minutes and seconds respectively: "; cin >> t1.hours >> t1.minutes >> t1.seconds; cout << "Enter stop time." << endl; cout << "Enter hours, minutes and seconds respectively: "; cin >> t2.hours >> t2.minutes >> t2.seconds; computeTimeDifference(t1, t2, &difference); cout << endl << "TIME DIFFERENCE: " << t1.hours << ":" << t1.minutes << ":" << t1.seconds; cout << " - " << t2.hours << ":" << t2.minutes << ":" << t2.seconds; cout << " = " << difference.hours << ":" << difference.minutes << ":" << difference.seconds; return 0; } void computeTimeDifference(struct TIME t1, struct TIME t2, struct TIME *difference){ if(t2.seconds > t1.seconds) { --t1.minutes; t1.seconds += 60; } difference->seconds = t1.seconds - t2.seconds; if(t2.minutes > t1.minutes) { --t1.hours; t1.minutes += 60; } difference->minutes = t1.minutes-t2.minutes; difference->hours = t1.hours-t2.hours; } ``` **輸出** ```cpp Enter hours, minutes and seconds respectively: 11 33 52 Enter stop time. Enter hours, minutes and seconds respectively: 8 12 15 TIME DIFFERENCE: 11:33:52 - 8:12:15 = 3:21:37 ``` 在該程序中，要求用戶輸入兩個時間段，這兩個時間段分別存儲在結構變量`t1`和`t2`中。 然后，`computeTimeDifference()`函數計算時間段之間的時差，結果從`main()`函數顯示在屏幕上，而不會返回（通過引用調用）。