C++ Omit Array Size
Omit Array Size
In C++, you don't have to specify the size of the array. The compiler is smart enough to determine the size of the array based on the number of inserted values:
string cars[] = {"Volvo", "BMW", "Ford"}; // Three array elements
The example above is equal to:
string cars[3] = {"Volvo", "BMW", "Ford"}; // Also three array elements
However, the last approach is considered as "good practice", because it will reduce the chance of errors in your program.
Omit Elements on Declaration
It is also possible to declare an array without specifying the elements on declaration, and add them later:
Example
string cars[5];
cars[0] = "Volvo";
cars[1] = "BMW";
cars[2] = "Ford";
cars[3] = "Mazda";
cars[4] = "Tesla";
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Note: The example above only works when you have specified the size of the array.
If you don't specify the array size, an error occurs:
Example
string cars[]; // Array size is not specified
cars[0] = "Volvo";
cars[1] = "BMW";
cars[2] = "Ford";
cars[3] = "Mazda";
cars[4] = "Tesla";
// error: array size missing in 'cars'
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