Use of Macro Expansion

Asked Dec 02 '14 at 04:45

Active Dec 02 '14 at 04:45

Viewed 38 times

Can anyone Explain what exactly is the use of the Macro Expansion In C or C++ Program.

# define UPPER 3
main()
{
int i;
for(i=0;i<UPPER;++i)
cout<<i;
}

The same thing could be achieved using constants and making there scope global, then why do we use it, are they used just to increase the readability of the program?

asked Dec 02 '14 at 04:45

Rohit Saluja

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I prefer `enum { UPPER = 3; }`. avoid macro if you can – Bryan Chen Dec 02 '14 at 04:48
Macros are useful for many things, but that isn't a good example. – Retired Ninja Dec 02 '14 at 04:50
It has no benefit in the above case than `const int UPPER = 3;` but in some cases macros can be beneficial. With `#define PR(x) (cout << #x " = " << x)`, you can use `PR(i)` instead of `cout << i`. – Simon Woo Dec 02 '14 at 05:11

Use of Macro Expansion

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