How can you assign values to a union in the C language?

In C language, you can assign values to a union using the following methods:

1. Assign values using the dot operator (.) : by specifying the name of the union member, assign the value to the corresponding member. For example:
2. union myUnion {
   int i;
   float f;
   };

   union myUnion u;
   u.i = 10; // Assigning a value to member i of the union
   u.f = 3.14; // Even though we are assigning a value to member f, it will change the value of the entire union.

3. The assignment operator (=) is used to replace the value of an entire union with the value of another union that has the same member types. For example:
4. Define a union named myUnion with members int i and float f. Create instances u1 and u2 of myUnion. Set u1.i to 10 and assign the value of u1 to u2.
5. Use the memcpy function to copy the value of one union to another union. For example:
6. The code snippet includes the string.h library and defines a union called myUnion containing an integer and a float. Two instances of myUnion, u1 and u2, are declared. The integer value of u1 is set to 10, and the memcpy function is used to copy the value of u1 into u2.

Please note that members of a union share the same memory space, so assigning a value to one member will affect the other members. To avoid uncertain behavior, it is important to ensure that before assigning a value to one member of the union, the value of another member has been read or initialized.