With the exception that arrays are fixed size, we use arrays in ways that are similar to how we use vectors. For example, we can reimplement our grading program from § 3.3.3 (p. 104) to use an array to hold the cluster counters

// count the number of grades by clusters of ten: 0--9, 10--19, ... 90--99, 100
unsigned scores[11] = {}; // 11 buckets, all value initialized to 0
unsigned grade;
while (cin >> grade) {
if (grade <= 100)
++scores[grade/10]; // increment the counter for the current cluster
}