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# Having problem with Array practice excises

Posted on 1998-12-13

Write a function 'identity' which returns a 1 if the array argument passed to it represents an identity matrix, and returns 0 otherwise.

An identity matrix is an m by m array of integers, where the values of the elements on the principle diagonal (row subscript == col subscript)equal 1, and all other elements are 0.

for example:

1 0 0 0

0 1 0 0

0 0 1 0

0 0 0 1

is an identity matrix of order 4 by 4,

1 0 0

0 1 0

0 0 1

is an identity matrix of order 3 by 3,

and

1 1 5

0 1 0

0 0 1

is NOT an identity matrix.

The function identity is passed two arguments: the array, and the order of the matrix (ie the size of the two dimensions). Thus the prototype of the function would be written as:

int identity (int a[][], int m);

where a is the array and m represents the number of rows and columns.

You may assume that the number of rows always equals the number of

columns

for the array.