Question

Union Data

{
int i;
float f;
char str[20];
};

Given the inherent behavior of unions and the source code union definition above, how much memory will be allocated for a variable of data type union Data?

Answer 1

A variable of type union Data will allocate 20 bytes of memory, the size of its largest member, the char array str[20].

Step-by-step explanation:

The question pertains to the amount of memory that will be allocated for a variable of the union Data type in C programming. A union allocates memory equal to the size of its largest member. In the provided union, there are three members: an int (typically 4 bytes), a float (typically 4 bytes), and a char array of 20 characters (20 bytes).

Therefore, the union Data will allocate memory equal to the size of its largest member, which is the char array str[20].

As such, the total memory allocation for union Data would be 20 bytes, assuming that a char is 1 byte. It's important to note that this size may vary depending on the architecture and compiler-specific alignment and padding rules.