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C Language > Learn C Language > When I declare a struct in C, does it automatically...
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When I declare a struct in C, does it automatically allocate memory for me using malloc()?

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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...
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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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