Functions getMinimum and getMaximum

Member functions getMinimum, getMaximum, outputBarChart and outputGrades each loop through array grades by using nested range-based for or counter-controlled for statements. For example, consider the nested for statement (lines 59–68) in member function getMinimum. The outer for statement loops through the rows that represent each student and the inner for loops through the grades of a given student. Each grade is compared with variable lowGrade in the body of the inner for statement. If a grade is less than lowGrade, lowGrade is set to that grade. This repeats until all rows and columns of grades have been traversed. When execution of the nested statement is complete, lowGrade contains the smallest grade in the two-dimensional array. Member function getMaximum works similarly to member function getMinimum.