WebNov 8, 2024 · Sorted by: 47. The L specifies that the number is a long type, so -1L is a long set to negative one, and 1L is a long set to positive one. As for why ftell doesn't just return NULL, it's because NULL is used for pointers, and here a long is returned. Note that 0 isn't used because 0 is a valid value for ftell to return. WebNov 17, 2024 · C语言 操作符分类解析与使用. C 语言提供了丰富的操作符,有:算术操作 …
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WebJun 17, 2024 · 前言. 在C/C++中有许多拥有各种功能的操作符,用来实现我们需求,比如 … WebApr 6, 2024 · 本文内容. 如果左操作数的值不为 null,则 null 合并运算符 ?? 返回该值;否 … heart foundation australia donations
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Webc++ 运算符 运算符是一种告诉编译器执行特定的数学或逻辑操作的符号。c++ 内置了丰富 … Web符号 ::和: 的作用和区别. “::”指明了成员函数所属的类。. 如:M::f (s)就表示f (s)是类M的 … WebBuild the Code. Build everything with make.GNU make can handle parallel tasks with a -jN argument, and it”s common to use a number of tasks N that”s between 1 and 2 times the number of hardware threads on the computer being used for the build.E.g. on a dual-E5520 machine (2 CPUs, 4 cores per CPU, 2 threads per core), the fastest builds are made with … heart foundation borg scale