#define a 4
main()
{
a++;
printf("%d",a);
}
output
Compilation Error:
Lvalue Required.
How?
#define defines a constant not a variable and also 'a' is replaced with '4' while expanding code.
a++; will be 4++;. we can't increment constant value(4=4+1).
NOTE:constant won't changes its value.
variable can change its value.
