让我们编译和运行上面的程序,这将产生以下结果: data.i : 10data.f : 220.500000data.str : C Programming 这里,所有的成员都得到打印得非常好,因为一个部件被一次使用。 应用场合 当多个数据需要共享内存或者多个数据每次只取其一时,可以利用联合体(union)。在C Programming Language 一书中对于联合体是这么描述...
In the C programming language, a union is a user-defined data type that allows different types of data to be stored in the same memory location. It provides a way to define a variable that may have different data types, but at any given time, only one member of the union can hold a...
在The C Programming Language里面讲述union内存分配的原话是 1)联合体就是一个结构 2)联合体的所有成员相对于基地址的偏移量为0 3)此结构空间要大到总够容纳最“宽”的成员 4)并且,其对齐方式要适合于联合体中所有类型的成员 第4点本质表达:所有变量类型还要取一个最小公倍数;再结合第3点统一给下个总的定...
参考资料: [1] https://www.allaboutcircuits.com/technical-articles/union-in-c-language-for-packing-and-unpacking-data/ [2] https://www.allaboutcircuits.com/technical-articles/learn-embedded-c-programming-language-understanding-union-data-object/. [3] https://stackoverflow.com/questions/252552/wh...
[1] https://www.allaboutcircuits.com/technical-articles/union-in-c-language-for-packing-and-unpacking-data/ [2] https://www.allaboutcircuits.com/technical-articles/learn-embedded-c-programming-language-understanding-union-data-object/. [3] https://stackoverflow.com/questions/252552/why-do-we-...
[1]https://www.allaboutcircuits.com/technical-articles/union-in-c-language-for-packing-and-unpacking-data/ [2]https://www.allaboutcircuits.com/technical-articles/learn-embedded-c-programming-language-understanding-union-data-object/. [3]https://stackoverflow.com/questions/252552/why-do-we-need...
Learn about packing and unpacking data with unions in C language. In a previous article, we discussed that the originalapplication of unions had been creating a shared memory areafor mutually exclusive variables. However, over the time, the programmers have widely used unions for a completely diff...
[1] https://www.allaboutcircuits.com/technical-articles/union-in-c-language-for-packing-and-unpacking-data/ [2] https://www.allaboutcircuits.com/technical-articles/learn-embedded-c-programming-language-understanding-union-data-object/. [3] https://stackoverflow.com/questions/252552/why-do-we-...
C Union with programming examples for beginners and professionals covering concepts, control statements, Advantage and disadvantage of union over structure, C Union example. Let's see a simple example of union in C language.
in C? #include <stdio.h> #include <stddef.h> #include <assert.h> // Example `union` in C union int_or_char { int i; char c; }; // Compare it to this to the similar `struct` struct int_and_char { int i; char c; }; int main(void) { // The struct makes room for bo...