Arrays

Question 1

Two ways to declare an array

Answer 1

int someInts[3];

int someInts[] = {2,3,4};

Question 2

Can array be compared with ==?

Answer 2

Nope! Arrays are just pointers to the first element, so that’ll compare the addresses of the first elements

Question 3

Is size stored in an array? A vector?

Answer 3

No to an array, its only used to set aside memory when first allocated. Vectors do though!

Question 4

Where is someInts[2] located in memory?

Answer 4

&someInts[2] = {address of someInts} + (sizeof(int) *i)

Question 5

Row major order

Answer 5

they are stored row by row in memory, [0,0][0,1][0,2][1,0][1,1][1,2]

Question 6

Command line paramteters?

Answer 6

int main (int argc, char **argv)

• argc is the num of elements in argv
• argv[0] is the exectuable name, a.out
• they are c-style strings!