c# 小程序支付后臺示例

The #if is a preprocessor directive in C programming language and it is used for conditional compilation.

#if是C編程語言中的預處理程序指令，用于條件編譯。

General for of the #if directive is:

#if指令的常規為：

#if conditional_expression statements;#endif

If conditional_expression is true, the code written between #if and #endif i.e. the statements will be executed.

如果conditional_expression為true，則將執行在#if和#endif之間編寫的代碼，即語句 。

Example:

例：

#include <stdio.h>#define MAX_GF 100int main(){printf("Hello\n");#if MAX_GF>=50printf("Wau, you may have more than 50 girlfriends\n");printf("Code for more than 50 GFs\n");#endifprintf("Bye!\n");return 0; }

Output

輸出量

HelloWau, you may have more than 50 girlfriendsCode for more than 50 GFsBye!

翻譯自: https://www.includehelp.com/c-programs/if-directive-example.aspx

c# 小程序支付后臺示例

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