Assume a 64 bit system, where the sizeof (int) is 4 bytes, and sizeof (float) is

Question

Assume a 64 bit system, where the sizeof (int) is 4 bytes, and sizeof (float) is also 4 bytes The following questions refer to the code below: void* g (int x) union merged int x; float y static int counter-0; ++count; union merged* ptr-malloc (sizeof (merged)) if (ptr) return NULL; ptr-x-x; return ptr; (a) What is the sizeof (union merged)? b) Which variables are allocated on the stack, which variables are allocated on the heap and which variables are allocated in the static storage area? (c) What are the lifetimes of each of the variables listed above?

Explanation / Answer

Ans-(a) According to the defintion of union,A union is a special data type available in C that allows storing different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple purposes.

Therefore,

union merged{

int x;

float y;};

so it has two members, size of int is 4 bytes and size of float is also 4 bytes. Therefore maximum size is 4 bytes . Therefore sizeof(union merged) is also 4 bytes.

(b) Variables that are allocated on stack:- x,y

Variables that are allocated on heap:- ptr

Variables that are alloacetd on static storage area:- count

(c) Lifetime of static variable count is throughout the program.

lifetime of ptr and x and y is in the function g only.

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