This example is little complex. You will understand it more clearly after reading the user defined data types.
Problem: Design an algorithm to find average of SALARY in an array of EMP struct containing information EMPNO, EMPNAME, and SALARY.
Input: A list employees of the type struct.
Output : Display the average of SALARY.

AVG_SALARY(LIST, SIZE)
[LIST is an array of EMP, SIZE is size of array]
SUM<-- 0
Repeat For I=1,2,3,........SIZE
SUM<--SUM +LIST[I].SALARY
[END of For I]
AVG <-- SUM / SIZE
Write :  'The average Salary is', AVG
Exit

Note : An algorithm, that perform sub-task, may be called in another algorithm. It is a better practice to divide the given problem into sub-problems ans write the individual algorithm to solve such sub-problems. Write the main algorithm to call the sub-algorithms in order to solve the main problem.