Procedural Programming with C++ 10 seconds

int scores[10]: what is the last valid index?

Ten seconds. Go. What is the last safe index of scores[10]?

Lesson notes

Declare, initialise and traverse 1D arrays and avoid out-of-bounds access

Key points

Arrays in C++ are indexed from 0, so the ten elements are scores[0] to scores[9].
scores[10] is out of bounds, and C++ will not stop you, so the loop must use i < 10.

Takeaway: Size n means indices 0 to n−1, and C++ never checks bounds.

Quick check: int scores[10]; holds 10 students' marks. What is the largest index you may safely use?

10
9
11

Last valid index = size − 1; loop with i < size, never i <= size.

arrayindexbounds

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