How many values can each element in a seven-element array hold?

Answer 1

As many as you like. It ultimately depends on the type of the array. An array of int can obviously only store one integer value per element, however an array of integer arrays would allow us to store two or more integers per element. This is precisely how multi-dimensional arrays are implemented:

int x[4][5];

Here we've declared a 4-element array where each element is an array of 5 integer elements. Thus each element of the "outer" array can hold 5 values in the "inner" arrays. In reality this is just a 20-element array with one integer per element, but because we declared it multi-dimensionally we can refer to each of the 4 "inner" arrays individually as an array in its own right.

Arrays of arrays are useful when dealing with homogeneous types, but if we need to store heterogeneous types we can use an array of structures instead:

typedef struct person_t {

char name[50];

size_t age;

} person;

person x[100];

Here we've declared an array of 100 person objects. But each person object has two member values associated with it; a name and an age:

x[0].name = "Joe Bloggs";

x[0].age = 42;