Arrays in C An array is a collection of data items, all of the same type , accessed using a common name . A one-dimensional array is like a list (vector) . A two-dimensional array is like a table (matrix) . Arrays can also have more dimensions . Memory Characteristics Array elements are stored in contiguous (adjacent) memory locations . Elements can be randomly accessed . The address of each element can be calculated using: Base address Size of each data element Declaring Single Dimensional Arrays Array variables are declared like normal variables, except: The variable name is followed by square brackets [ ] The brackets contain the array dimension (size) Rules Dimensions must be positive integers or constant expressions . In C99 , variables may be used as sizes if they hold a positive value at declaration. Memory is allocated only once when declared. Array size does not change later , even if the variable used changes. E...
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