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Asked by Vidyarajeev Last Modified
Answer 
when we declace header that is struct xyz
{.....
} ;
its not going to allocate any memory . memory is only allocated when we declare a variable of structure type .
so if we declare the variable
ex: struct xyz v1;
then the memory will be allocated for v1 during compile time .
simlary if we use malloc
it allocate the memory required for structure and store the address of first byte in a structure variable In this case the memory is allocated runtime ( dynamic)
so it is must to declare a variable or use malloc in program to allocate memory .
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