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???

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

Code:

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const int n = 10;

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

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

Code:

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#define n 10

// how you wrote it
if (n == 10)
  puts("n = 10");


// now the compiler sees it
if (10 == 10)
  puts("n = 10");

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thanks alot...... :)