"C allows you to declare and use arrays. Since C is statically typed, arrays must also be typed when they are declared and may only hold that particular type of element. C supports the use of both static arrays and dynamic arrays through standard library calls.\n\nTo declare a static array, you use syntax similar to declaring a regular variable, but you use square brackets to designate the variable as an array. Within the square brackets you indicate the size (number of elements) in the array. For example:\n\nint arr[5];\n\ndouble values[10];\n\nThe two declarations above create arrays of size 5 and 10 respectively. The array types are also defined using the usual keywords. In this case, arr can only hold int values and values can only hold double values. Arrays follow the same naming rules and conventions as regular variables. Many times, identifiers are made plural as an array naturally holds more than one value.\n\nAnother way to declare an array is to use the compound declaration and assignment syntax whereby you can initialize an array to hold a certain list of values.\n\nint a[] = { 2, 3, 5, 7, 11 };\n\nUsing this syntax we do not need to specify the size of the array as the compiler is smart enough to count the number of elements we’ve provided. The elements themselves are denoted inside curly brackets and delimited with commas.\n\nC99 introduced Variable Length Arrays (VLAs, which are also supported in GNU C89) which allow you to declare a static array whose size is determined by a variable. For example:\n\nint n = 5;\n\nint arr[n];\n\nor within a function:\n\nvoid foo(int n) {\n\nint arr[n];\n\n...\n\n}\n\nIn either case, care must be taken as static arrays are allocated on the stack. The stack is generally small and allocating even a moderately large array on the stack may lead to a stack overflow. In addition, VLAs are not supported in any C++ standard and should be avoided if portable code is desired."