exit c+

exit() is a library function in C/C++ programming language, it is used to terminate the calling process (function) immediately i.e. we can say it is used for the normal program termination and also perform the several cleanup steps.

exit()是C / C ++編程語言中的一個庫函數，它用于立即終止調用進程(函數)，即可以說它用于正常程序終止并執行幾個清理步驟。

Syntax:

句法：

void exit(int status);

Parameter(s): status – defines the exit status.

參數： status –定義退出狀態。

There are two status that we can define,

我們可以定義兩種狀態，

ValueMacroDescription

0	EXIT_SUCCESS	It defines that the termination is on the success of the program.
1	EXIT_FAILURE	It defines that the termination is on the failure of the program.

值 巨集 描述

0	EXIT_SUCCESS	它定義了程序成功的終止。
1個	EXIT_FAILURE	它定義終止是在程序失敗時進行的。

Return value: The return type of the function is void, it returns nothing.

返回值：函數的返回類型為void ，不返回任何內容。

1) exit(0) or exit(EXIT_SUCCESS)

1)退出(0)或退出(EXIT_SUCCESS)

exit(0) is used to terminate the program by specifying the successful execution of the program.

exit(0)用于通過指定程序的成功執行來終止程序。

Syntax:

句法：

exit(0);

2) exit(1) or exit(EXIT_FAILURE)

2)退出(1)或退出(EXIT_FAILURE)

exit(1) is used to terminate the program by specifying the successful execution of the program.

exit(1)用于通過指定程序的成功執行來終止程序。

Syntax:

句法：

exit(1);

Example 1:

范例1：

Here, we are reading two numbers and then dividing them, if the second number is 0 then exiting the program using exit(1) and if the second number is not 0 then performing the division operation and exiting the program using exit(0).

在這里，我們正在讀取兩個數字，然后將它們相除，如果第二個數字為0，則使用exit(1)退出程序；如果第二個數字不為0，則執行除法運算，然后使用exit(0)退出程序。

// C++ program to demonstrate the // example of exit(0) and exit(1)#include <iostream> using namespace std;int main() {int a;int b;cout << "Enter divisor (value of a): ";cin >> a;cout << "Enter dividend (value of b): ";cin >> b;cout << "a: " << a << endl;cout << "b: " << b << endl;if (b == 0) {cout << "Dividend must not be 0..." << endl;// EXIT_FAILUREexit(1);}cout << a << "/" << b << " : " << (float)a / (float)b << endl;// EXIT_SUCCESSexit(0); }

Output:

輸出：

RUN 1: Enter divisor (value of a): 10 Enter dividend (value of b): 3 a: 10 b: 3 10/3 : 3.33333RUN 2: Enter divisor (value of a): 10 Enter dividend (value of b): 0 a: 10 b: 0 Dividend must not be 0...

Example 2:

范例2：

Here, we are opening a file in read-only mode, if the file doe not exit then exiting the program using exit(1), and file exists then closing it and exiting the program using exit(0).

在這里，我們以只讀模式打開文件，如果文件沒有退出，則使用exit(1)退出程序，并且文件存在，然后將其關閉并使用exit(0)退出程序。

// C++ program to demonstrate the // example of exit(0) and exit(1)#include <stdio.h> #include <stdlib.h>int main() {FILE* fPtr;// opening the filefPtr = fopen("hello1.txt", "r");// checking whether file exists or notif (fPtr == NULL) {printf("oops, file does not exist...");// EXIT_FAILUREexit(1);}printf("File opened successfully...");// clsoing the filefclose(fPtr);// EXIT_SUCCESSexit(0); }

Output:

輸出：

oops, file does not exist...

出口(0)和出口(1)之間的區別 (Difference between exit(0) and exit(1))

exit(0)exit(1)

It is used to terminate the program normally by specifying that operation is successful.	It is also used to terminate the program normally by specifying that operation is not successful.
The syntax is, exit(0);	The syntax is,
0 is the value of EXIT_SUCCESS. Thus, we can also use exit(EXIT_SUCCESS) instead of exit(0).	1 is the value of EXIT_FAILURE. Thus, we can also use exit(EXIT_FAILURE) instead of exit(1).
exit(0) is fully portable.	exit(1) is not fully portable.
exit(0) defines the clean exit without any error.	exit(1) defines that there was an error in the program and the program is terminated.

退出(0) 出口(1)

通過指定操作成功，它通常用于終止程序。	通過指定操作不成功，它也可用于正常終止程序。
語法是 exit(0);	語法是
0是EXIT_SUCCESS的值。 因此，我們也可以使用exit(EXIT_SUCCESS)代替exit(0) 。	1是EXIT_FAILURE的值。 因此，我們也可以使用exit(EXIT_FAILURE)代替exit(1) 。
exit(0)是完全可移植的。	exit(1)并非完全可移植。
exit(0)定義干凈出口，沒有任何錯誤。	exit(1)定義程序中存在錯誤，并且程序終止。

翻譯自: https://www.includehelp.com/cpp-tutorial/exit-0-vs-exit-1-in-c-cpp-with-examples.aspx

exit c+

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