Which data type to use inorder to store value in optimum way

 

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  • What does the C++ standard state the size of int, long type to be? 24 answers

    • An unsigned short will consume half the memory of a signed int (2 bytes vs 4 bytes). Because the processor often needs to work on whole integers the execution might be slightly slower since it needs to unpack the shorts.

    In your case you could also use a signed short, it ranges from roughly -32K to +32K.

    depends : lets say you want to create an array of size 1000000 

    int foo[1000000] ={};//4000000 byte
unsigned short foo[1000000]={}; //2000000 byte 
//you save 2 MB of memory

    but 

    int foo;
unsigned short foo;
//that's two bytes not much really  even when multiplied by a dozen of variables...
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