In C++, you must provide an index to access a specific element within the array. An index must be a counting type (such as int), as demonstrated here:

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This is akin to the way that rental cars are numbered. However, unlike humans, C++ starts with 0 when numbering its arrays. Thus the first score in the array nScores is nScores[0].

So how does this work exactly? Well, think of a rental car parking lot. The figure shows how rental cars are typically numbered in their parking lots. The first car in row B carries the designation B1. To find B11, simply move your gaze ten cars to the right.

C++ does a similar thing. To execute the statement nScores[11] = 10, C++ starts with the address of the first element in nScores. It then moves to the right 11 spaces and stores a 10 at that location. This is shown graphically in the following figure.

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Aug 29, 2017  const char& string::at (sizetype idx) const idx: index number Both forms return the character that has the index idx (the first character has index 0). For all strings, an index greater than or equal to length as value is invalid. If the caller ensures that the index is. In C, you must provide an index to access a specific element within the array. An index must be a counting type (such as int), as demonstrated here: nScores = 10.

The fact that C++ starts counting at zero leads to a point that always confuses beginners. The statement

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declares 100 scores, which are numbered from 0 to 99. The expression

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zeroes out the first element beyond the end of the array. The last element in the array is nScores[99]. The C++ compiler will not catch this error and will happily access this non-element, which very often leads to the program accessing some other variable by mistake. This type of error is very hard to find because the results are so unpredictable.