array size and const
In C++
const int a[]={1,2,3,4,5}; int b[a[2]];
int main()
{
return 0;
} The code is giving error in line 2; However, if it is something like below it gives no error after compilation:
const int a=3; int b[a];
int main()
{
return 0;
} Why is that?
In first case declaring array a constant doesn't make its all element constant so it will showing variable type declaration outside the main error when we compile it........
ReplyDeleteyeah correct explanation...
ReplyDeletewhen we declare an array a constant, why doesnt it make all elements constant??
ReplyDelete@ B Ramesh Because in C++ array sizes must be constant expressions, not just constant data. Array data, even though const, is not a constant expression.
ReplyDeleteSecond version IS a constant expression.