Assume that an int variable x has already been declared,. write an expression whose value is the last (rightmost) digit of x.

The last digit is in the tens place.

Assuming Java:

int expression = x - (x/10) * 10;

Because Java truncates decimal, the decimal will be truncated after dividing by 10. For example, if

int x = 5134

then x/10 = 513

Then x/10 * 10 = 5130

so 5134 - 5130 = 4, which is last digit.