Arrays are special variables which can hold more than one value using the same variable, using an index. Arrays are defined in a very straightforward syntax. Accessing a number from the array is done using the same syntax. Notice that arrays in C are zero-based, which means that if we defined an array of size 10, then the array cells 0 through 9 (inclusive) are defined. numbers is not an actual value. Arrays can only have one type of variable, because they are implemented as a sequence of values in the computer's memory. Because of that, accessing a random array cell is very efficient.
/* defines an array of 10 integers */ int numbers; /* populate the array */ numbers = 10; numbers = 20; numbers = 30; numbers = 40; numbers = 50; numbers = 60; numbers = 70; /* print the 7th number from the array, which has an index of 6 */ printf("The 7th number in the array is %d", numbers);