What is the difference between #define n 10 and const int n=10???

This is a discussion on What is the difference between #define n 10 and const int n=10??? within the C Programming forums, part of the General Programming Boards category; can any one explain me plz that What is the difference between #define n 10 and const int n=10???...

  1. #1
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    What is the difference between #define n 10 and const int n=10???

    can any one explain me plz that What is the difference between #define n 10 and const int n=10???

  2. #2
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    const int n = 10; is a numerical constant stored as an integer value.

    Code:
    const int n = 10;
    
    // the compiler sees this exactly as you wrote it
    if (n == 10)
     puts("n = 10");


    #define n 10 works by text substitution... that is where it finds n it replaces it with 10...

    Code:
    #define n 10
    
    // how you wrote it
    if (n == 10)
      puts("n = 10");
    
    
    // now the compiler sees it
    if (10 == 10)
      puts("n = 10");

  3. #3
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    thanks alot......

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