Question

Give the proper array declaration for the following:
a) declare an integer array which can hold 25 values
b) declare a two dimensional array called mat 3 x 4 of integer​

Answer 1

Answer:

ARRAYS IN C++

An array is a collection of elements of the same type placed in contiguous memory locations that can be individually referenced by using an index to a unique identifier.

Five values of type int can be declared as an array without having to declare five different variables (each with its own identifier).

For example, a five element integer array foo may be logically represented as;

where each blank panel represents an element of the array. In this case, these are values of type int. These elements are numbered from 0 to 4, with 0 being the first while 4 being the last; In C++, the index of the first array element is always zero. As expected, an n array must be declared prior its use. A typical declaration for an array in C++ is:

type name [elements];

where type is a valid type (such as int, float ...), name is a valid identifier and the elements field (which is always enclosed in square brackets []), specifies the size of the array.

Thus, the foo array, with five elements of type int, can be declared as:

int foo [5];