C++ Program

What are Built-in arrays What are Built-in arrays The "" operator defines arrays of char. Similarly, we can define an array of any type with the [ ] operator : int n[4] = { 1, 2, 3, 4 }; The compiler is able to determine by itself the size of an array, so you do not have to specify it : int poweroftwo[] = { 1, 2, 4, 8, 16, 32, 64, 128 }; As we said, the compiler keeps the information about the size of arrays (or strings), so the sizeof operator returns the size of the array as expected : #include <iostream> int main(int argc, char **argv) { int hello[] = { 1, 2, 3 }; char something[] = "abcdef"; cout << sizeof(hello) << ’ ’ << sizeof(something) << ’\n’; } The size of arrays is always known and has to be known at compilation time. Note : from that, you can compute the number of element of an array by dividing the sizeof the array by the sizeof the element type.