Member Functions getMinimum and getMaximum

Lines 48–49 in processGrades call member functions getMinimum and getMaximum to determine the lowest and highest grades of any student on the exam, respectively. Let’s examine how member function getMinimum finds the lowest grade. Because the highest grade allowed is 100, we begin by assuming that 100 is the lowest grade (line 58). Then, we compare each of the elements in the array to the lowest grade, looking for smaller values. Lines 61–66 in member function getMinimum loop through the array, and line 64 compares each grade to lowGrade. If a grade is less than lowGrade, lowGrade is set to that grade. When line 68 executes, lowGrade contains the lowest grade in the array. Member function getMaximum (lines 72–85) works similarly to member function getMinimum.